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CBSE Questions for Class 11 Medical Biology Cell The Unit Of Life Quiz 9 - MCQExams.com
CBSE
Class 11 Medical Biology
Cell The Unit Of Life
Quiz 9
A cell organelle containing hydrolytic enzymes is
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Ribosome
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Mesosome
0%
Lysosome
0%
Microsome
Explanation
The ribosome is the site of protein synthesis.
Mesosome is an extension of the cell membrane presence in the cytoplasm as infolding and serves to increases surface area and as the site for cellular respiration in prokaryotes.
Microsome refers to the fraction of ER studded with the ribosome.
Lysosomes are the suicidal bags of cell that have hydrolytic enzymes and serve to digest and remove the wear and tear organelles and molecules from the cell.
Therefore, the correct answer is option C.
Which cell organelle carries the functions of mechanical support, enzyme circulation, protein synthesis and detoxification of drugs?
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Chromoplast
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Chloroplast
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Mitochondria
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Endoplasmic reticulum
Explanation
The endoplasmic reticulum is a network of numerous branched membranes from nuclear membrane to plasma membrane which is extensively spread in the cytoplasm. It acts as endoskeleton of the cell due to which mechanical support is provided to the cell.
Endoplasmic reticulum works as a circulatory and transporting system for the circulation of substances in the cell. Rough endoplasmic reticulum helps in protein synthesis because ribosomes are present on it. Smooth endoplasmic reticulum mainly synthesises lipids and helps in the detoxification of drugs. Thus option D is the correct answer.
The process by which specific materials can be moved across a plasma membrane with the help of transport protein is
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Concentration gradient
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Active transport
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Osmosis
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Facilitated transport
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Phagocytosis
Explanation
Concentration gradient refers to the difference in the concentration of substances on either side of compartments. Active transport is the uphill movement of substances and requires ATP-powered pumps. Osmosis is the movement of the solvent through a semipermeable membrane down the concentration gradient. Transport hydrophilic small molecules down their concentration gradient is carried out by specific channel proteins and is termed as facilitated diffusion. Phagocytosis is mediated by outgrowth of the cell membrane and does not require any channel proteins. Thus, the correct answer is D.
Which organelle digests or dissolves worn out organelles?
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cell membrane
0%
nucleus
0%
lysosomes
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mitochondria
0%
vacuole
Explanation
Lysosomes are very minute round or irregularly shaped bag like particles containing enzymes which are bounded by membrane outside.
Lysosomes help in the digestion of food substances brought by phagocytosis or pinocytosis processes and also dissolves worn-out organelles.
Thus option C is the correct answer.
In a humoral response, the main function of a B-cell is to make antibodies against antigens.
Which organelle would be well represented in an electron micrograph of a such a cell?
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Mitochondria
0%
Peroxisomes
0%
Lysosomes
0%
Rough endoplasmic reticulum
Explanation
Antibodies are proteins, usually consisting of heavy and light chains. Proteins are secreted by Rough Endoplasmic Reticulum, that are modified and packed in the Golgi. In case of micrograph for a cell that manufactures antibodies, should represent abundance of RER.
So, the correct answer is '
Rough endoplasmic reticulum'
Which of the following characteristics distinguish the prokaryotes from eukaryotes?
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The absence of membrane-bound organelles in prokaryotic cells
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Smaller and less complicated eukaryotic cells
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The presence of ribosomes in eukaryotic cells only
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The method of nutrition
Explanation
Membrane bound organelles are absent in prokaryotic cells, that is, a prokaryotic cell is not internally compartmentalized by endomembrane system for carrying out various functions. Instead all the functions are carried out by the cell membrane, while the genetic material is suspended in the cytoplasm.
So, the correct answer is '
The absence of membrane-bound organelles in prokaryotic cells'
Which of the given cell organelles carry out the functions given in the table?
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Ribosomes
0%
Chloroplast
0%
Mitochondria
0%
Endoplasmic reticulum
Explanation
The endoplasmic reticulum is a network of numerous branched membranes from nuclear membrane to plasma membrane which is extensively spread in the cytoplasm. The smooth endoplasmic reticulum synthesises the lipids which help in the formation of the plasma membrane and provides mechanical support. It also helps in detoxification of drugs. The vesicles of the endoplasmic reticulum transport the synthesised enzymes to Golgi bodies for further modification. Rough endoplasmic reticulum synthesises proteins.
So, the correct answer is option D.
Which of the following macromolecules function as energy storage compounds, components of cell membranes and can also provide insulation?
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Proteins
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Carbohydrates
0%
Steroids
0%
Lipids
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Nucleic acids
Explanation
A. Proteins are the polymer of amino acids which are connected via peptide bond. Proteins account for more than 50% of the dry weight of most cells and make up about 15% by mass of our body. They are involved in structural support, storage, transport, signalling etc.
B. Carbohydrates are the compounds of carbon, hydrogen and oxygen. They are the complex organic molecules that are broken down to release energy.
C. Steroids are the derivatives of lipids. They are isoprenoid structures and are involved in regulation of carbohydrate metabolism.
D. Lipids are the hydrophobic compounds made up of carbon, hydrogen and oxygen. They act as reserve food material and store energy. They also act as insulation coats. Phospholipids which are a kind of lipids, are the major structural components of cell membranes.
E. Nucleic acids constitute the genetic material of all living organisms. Two important nucleic acids present in living cells are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA).
So, the correct answer is Lipids.
Which of the following is the correct sequence that a newly synthesized secretory protein would follow until it is exported from the cell?
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Smooth ER$$ \rightarrow$$ Rough ER $$\rightarrow $$ Golgi apparatus $$\rightarrow$$ Cell membrane
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Golgi apparatus $$\rightarrow$$ Rough ER $$\rightarrow $$ Cell membrane
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Golgi apparatus $$\rightarrow$$ Smooth ER $$\rightarrow $$ Cell membrane
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Rough ER $$\rightarrow $$ Golgi apparatus $$\rightarrow$$ Cell membrane
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Smooth ER $$\rightarrow $$ Golgi apparatus $$\rightarrow$$ Cell membrane
Explanation
A protein is first synthesized by ribosomes. Ribosomes are present on the Rough Endoplasmic Reticulum or RER. From RER, proteins are transported to Golgi apparatus for post-translational modification. From Golgi apparatus, proteins are packaged in membrane vesicles and transported to cells where they are engulfed by endocytosis by the invagination of the cell membrane.
Hence, the correct sequence of the path for newly synthesized protein will be RER, Golgi apparatus, Cell membrane.
So, the correct answer is '
Rough ER
→
→
Golgi apparatus
→
→
Cell membrane'.
Which cell organelle reduces the number of other organelles?
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Endoplasmic reticulum
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Mitochondria
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Lysosome
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Ribosome
Explanation
The lysosome is a membrane-bounded organelle found in animal cells. They contain hydrolytic enzymes that are capable of breaking down all types of biological polymers.
When a cell dies or the organelle is damaged, the enzymes released by the lysosomes clears the cell debris and even it is able to break its own proteins by the process of autolysis and so-known as the suicide bags.
Thus, the correct answer is option C
Prokaryotes have circular DNA while eukaryotes have linear chromosomes.
This is evidence that
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All eukaryotes are more closely related to each other than they are to prokaryotes.
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Eukaryotes are the ancestors of prokaryotes.
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Eukaryotes are the direct descendants of modern prokaryote species.
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Prokaryote DNA typically has more associated proteins than eukaryotic DNA.
Explanation
Eukaryotes are direct descendants of the prokaryotes as the linear strand of DNA has evolved from the prokaryotic DNA due to addition of repeats to the circular DNA and its further evolution prevented it from ligating back to the circular forms.
So, the correct answer is '
Eukaryotes are the direct descendants of modern prokaryote species'
______________ is the seat of biological oxidations .
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Endoplasmic reticulum
0%
ATP
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Mitochondria
0%
Golgi complex
Explanation
The biological oxidation process or reaction occurs all over the body in all living cells. The process occurs at cellular level to provide the body with usable energy.
It is also a slow and gradual aging process of the body. The seat for biological oxidation process inside a cell is the mitrochondria.
There are enzymes that catalyze the oxidation process are called oxidoreductases. Thus, thr correct option is C.
An interconnecting membranous network of the cell composed of vesicles, flattened sacs and tubules is :
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Nucleus
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Mitochondrion
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Endoplasmic reticulum
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Lysosome
Explanation
The endoplasmic reticulum is shortly abbreviated as ER. It is a type of organelle in eukaryotic cells.
The structure of ER is composed of the interconnected network of flattened and membrane-enclosed sacs or tube-like structures. These structures are known as cisternae.
There are two regions of the ER. Smooth ER and rough ER are classified on the basis of absence and presence of ribosomes on the surface of the ER respectively.
Thus, the correct answer is option C.
Lysosomes are produced by
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Golgi complex
0%
Mitochondria
0%
Endoplasmic reticulum
0%
Leucoplasts
Explanation
Correct option: A
Explanation:
Golgi bodies receive the protein synthesized by the endoplasmic reticulum in the vesicles which fuse with the cisternae of the cis face.
They fuse with the Golgi membrane and empty their contents into the lumen.
These proteins are further modified and packed into secretory vesicles.
Lysosomes are secretory vesicles that are produced by the trans face of the Golgi bodies and it contains several hydrolytic enzymes which help in cellular digestion.
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Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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Assertion is correct but Reason is incorrect
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Both Assertion and Reason are incorrect
Explanation
Lysosomes are the cell organelles found in the eukaryotic cells. They are used for the degradation of macromolecules by the process of phagocytosis, endocytosis, and autophagy.
They digest (breakdown) macromolecules (carbohydrates, lipids, proteins, and nucleic acids), repair cell membranes and respond against foreign substances such as bacteria, viruses, and other antigens.
They digest the macromolecules with the help of the digestive enzymes that break down the macromolecules and foreign invaders.
Due to the phagocytic nature, they are also called heterophonic vacuole or phagolysosome.
So, the correct answer is option A.
Suggest which among the following is not a function attributed to endoplasmic reticulum?
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Detoxification of poisons and drugs
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Digestion/ egestion of foreign materials outside the cell
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Manufacture of fat and lipid molecules
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Biogenesis of membrane proteins
Explanation
The endoplasmic reticulum is involved in the detoxification of the poisons and the drugs. This is the main function of the endoplasmic reticulum in the liver. The manufacturing of the lipids and fat molecules take place in the smooth ER. The membrane proteins are synthesised on the ribosomes which are present on the surface of the ER.
The digestion and egestion of the foreign materials which enter the cells take place in the lysosomes.
Thus, the correct answer is option B.
An animal cell, a plant cell and a bacterium share the following structural feature _______________.
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Cell membrane, Endoplasmic reticulum, Vacuoles
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Cell wall, Plasma membrane, Mitochondria
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Cell wall, Nucleus, Cytoplasm
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Plasma membrane, Cytoplasm, Ribosomes
The apoplast is located
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Outside the plasma membrane
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In the entire cytosol
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On both sides of plasma membrane
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In the plastidial content
Explanation
The apoplast is located outside the plasma membrane. Material can easily diffuse through it. It is interrupted by the Casparian strip, by air spaces and by the plant cuticle. The apoplastic route helps in the transport of water and solutes across the tissues. The process of transport is called as apoplastic transport.
Thus, the correct answer is option A.
Which of the following sentences is correct?
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Cells of all living organisms have a nucleus
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Both animal and plant cells have a well defined cell wall
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In prokaryotes there are no membrane bound cell organelles
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Cells are formed de novo from abiotic materials
Explanation
Prokaryotes are living cells but they lack an organised nucleus. The genetic material lies in the cytoplasm. So the statement is incorrect.
A plant cell has a well defined cell wall while animal cell starts with the plasma membrane they lack a cell wall.
So the statement is incorrect.
Prokaryotes are a primitive cell which lacks membrane-bounded organelles.
So the statement is correct.
Cells are basically formed by pre-existing cell and biomolecules which are considered as biotic materials.
So the statement is incorrect.
Thus, the correct answer is an option C.
Which of the following is always absent in prokaryotic cells?
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Ribosome
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Mitochondria
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DNA
0%
Cell wall
Explanation
A prokaryotic cell is a primitive cell which lacks membrane-bounded organelles and an organised nucleus.
Mitochondria is a membranous structure which is present in the eukaryotic cell and absent in prokaryotes.
There primary function is production of energy in form of ATP.
So, the correct answer is option B.
........... are embedded on the rough endoplasmic reticulum.
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Ribosomes
0%
Lysosomes
0%
Centrosomes
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Mesosomes
Explanation
a) The endoplasmic reticulum is associated with small dense granules called ribosomes, lying along the outer border of its membrane. They impart a rough appearance to the endoplasmic reticulum. The ribosomes synthesize the protein which is further modified by the endoplasmic reticulum.
b) Lysosomes are known as suicidal bags. They are spherical vesicles scattered in the cytoplasm which contains hydrolytic enzymes that help in intracellular digestion.
c) Centrosomes help to organize microtubules and perform cell division.
d) Mesosomes are folded invaginations in the plasma membrane of a prokaryotic cell which helps to increase the surface area for absorption.
So, the correct answer is option A.
House keeping proteins are found in
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Endoplasmic Reticulum
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Cytoskeleton
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Golgi Complex
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All of the above
Explanation
House keeping proteins are constitutive proteins that are required for the maintenance of basic cellular function. These proteins are needed in all the cells of the human body and are found in the endoplasmic reticulum. These are expressed in all the cells of the humans under normal physiological conditions.
So, the correct answer is option A.
Pick the odd one out among the following.
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Nucleus
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Nucleolus
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Chromosome
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Ribosome
Explanation
A
ribosome
is a component of cells that synthesizes protein chains. It is present outside the nucleus.
Nucleus is the control centre of the cell which contains the nucleolus and chromosomes.
Hence the correct option is D.
__________ is a prokaryote.
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Amoeba
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Bacteria
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Yeast
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Fungus
Explanation
Bacteria are examples of the prokaryotic cell.
In general, prokaryotic cells do not have a membrane-bound nucleus. In fact "pro-karyotic" is Greek for "before nucleus".
Hence B is the correct option.
The type of ribosomes found in prokaryotic cells is
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100S
0%
80S
0%
60S
0%
70S
Explanation
Prokaryotes are unicellular organisms that lack membrane-bound cell organelles. Ribosomes are the organelles made up of proteins and RNA molecules called subunits. These are involved in protein synthesis. The prokaryotic ribosomes are of 70S type, unlike the eukaryotic ribosomes which are of 80S type. The 70S ribosomes are made of 50S and 30S subunits. Thus the correct answer is option D.
DNA is not associated with histones in
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Prokaryotes
0%
Eukaryotes
0%
Fungi
0%
Animals
Explanation
Prokaryotes are unicellular organisms without membrane-bound organelles. They lack a true nucleus. Instead, they have nucleoid, a genetic material without the nuclear envelope. In prokaryotes, the genetic material is single circular double-stranded DNA without histones. They have a haploid chromosome.
Thus, the correct answer is 'Prokaryotes.'
An example of prokaryotic cell is
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Green algae
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Fungi
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Bacteria
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Bryophyte
Explanation
Prokaryotic cells are unicellular organisms that lack membrane-bound organelles such as mitochondria, Golgi complex. They also lack true nucleus. The genetic material is not surrounded by a nuclear envelope. The genetic material without nuclear envelope is called as nucleoid. Bacteria is a common example of prokaryotic cells.
Thus, the correct answer is 'Bacteria.'
Prokaryotes are characterized by
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Absence of internal compartmentalisation
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Absence of nucleus
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$$70$$S ribosome
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All the above
Explanation
Prokaryotes are unicellular organisms that lack membrane-bound organelles. They also lack true nucleus. They have nucleoid, genetic material without nuclear envelope. They posses ribosomes in the cytoplasm. They are also characterized by absence of internal compartmentalisation. All prokaryotes have 70S ribosomes. The 70S ribosome is made up of a 50S and 30S subunits. Examples of prokaryotes include bacteria, cyanobacteria.
Thus, the correct answer is 'All the above.'
Karyology is the study of
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Cytoplasm
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Cell
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Mitochondria
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Nucleus
Explanation
A karyotype is the number and appearance of chromosomes in the nucleus of a eukaryotic cell. The term is also used for the complete set of chromosomes in a species or in an individual organism. The study of whole sets of chromosomes is sometimes known as karyology. Hence, the karyology is the study of the nucleus.
So, the
correct answer is 'nucleus'.
The nucleus is separated from surrounding cytoplasm by a nuclear membrane, which is:
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Single layered with pores
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Single layered without pores
0%
Double layered with pores
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Double layered without pores
Explanation
Surrounding every nucleus is a double-layered membrane called the nuclear membrane or nuclear envelope. This membrane separates the nucleoplasm from the cytoplasm.
The nuclear membrane consists of two lipid bilayers - the inner nuclear membrane, and the outer nuclear membrane. It also has many small holes called nuclear pores that allow materials to move in and out of the nucleus.
So, the answer is 'C'.
In prokaryotes, mitochondria are absent. Krebs cycle occurs in
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Cytoplasm
0%
Nucleoid
0%
Ribosome
0%
Plasma membrane
Explanation
A prokaryotic cell like bacteria is typically devoid of membrane bound cell organelles. In such cells, biochemical activities like production of energy through Krebs cycle occurs on mesosomes. Mesosomes are complex infoldings of bacterial plasma membrane which increase biosynthetic area in a bacterial cell which is otherwise devoid of cell organelles.
Thus, the correct answer is Plasma membrane.
Which one is included under prokaryotes?
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Amoeba
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Algae
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Ulothrix
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Mycoplasma and Blue-Green Algae
Explanation
Prokaryotes are unicellular organisms that lack membrane-bound organelles such as mitochondria, golgi apparatus. They also lacks true nucleus. Instead, they have nucleoid. Nucleoid is genetic material without nuclear envelope. The examples of prokaryote include bacteria, Cyanobacteria or blue-green alage. Mycoplasma are small bacteria without cell wall. Hence, those are also included under prokaryotes.
Thus, the correct answer is 'Mycoplasma and Blue-Green Algae.'
Which part of the prokaryotic cell contain N-acetylglucosamine?
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Cell envelope
0%
Cell wall
0%
Nucleus
0%
Ribosomes
Explanation
Option (B)
The cell wall is the part of the prokaryotic
cell which contains N acetyl glucosamine.
It's a bond between glucosamine and the
acetic acid and is significant in cell walls.
The following are called "suicidal bags"
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Centrosomes
0%
Lysosomes
0%
Microsomes
0%
Mesosomes
Explanation
Lysosomes are membrane-bound organelles which are capable of breaking down biomolecules such as proteins, nucleic acids, carbohydrates and lipids.
It helps in digestion and waste removal within a cell.
They contain digestive enzymes that digest excess or worn out organelles, food particles, engulfed viruses or bacteria and macromolecules.
They are also known as suicidal bags because they can digest or damage its own cell causing the cell death (autolysis).
So, the correct answer is 'Lysosomes'.
The term cell membrane was coined by
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Nageli and Cramer
0%
Flemming
0%
Sachs
0%
Plowe.
Explanation
The cell membrane is a phospholipid bilayer that are selectively permeable membranes which separate the interior of the cells (cell organelles and cytoplasm) from the outside environment or the extracellular space.
The term cell membrane was coined by C. Nageli and C. Cramer in the year 1855.
Charles Overton discovered that plasma membrane is composed of lipids in the same year.
So, the correct answer is '
Nageli and Cramer'.
"Each cell leads a double life" was first proposed by_______.
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Schleiden
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Grew
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Von Mohl
0%
Malpighi
Explanation
Schleiden and Schwann presented a cell theory which proposed that each cell is itself is an organism which has all attributes of life. Each cell is living its individual life as well as the as a group of tissue which has become an integral part of plant. So Schleiden while observing plant cells discovered this double life of each cell. So option A is correct.
The selectively permeable membrane of the cell is
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Plasmalemma
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Cytoplasm
0%
Cell wall
0%
All of the above
Explanation
Plasma membrane (also known as the plasmalemma) is selectively permeable which allows the movement of certain substances into and out of the cell. It is made of two layers of proteins and phospholipids.
It allows proteins and lipid-soluble proteins to pass through it by means of active and passive transport. The proteins of the plasma membrane are of two types intrinsic and extrinsic.
The extrinsic proteins are loosely attached to the surface of the plasma membrane. Intrinsic proteins are attached deeply inside the membrane which acts as a channel protein and helps in the influx of cellular ions and molecules during active transport.
Phospholipids are lipids that have a hydrophobic tail that does not interact with water and a hydrophilic head which can interact with water.
So, the correct answer is option A.
Who believed in the individuality of cells?
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Leeuwenhoek
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Lamarck
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Dutrochet
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Malpighi
Explanation
In 1809, Lamarck concluded that all living beings are formed of cells. Living substance was first observed by Corti in 1772 and was named sarcode by Dujardin in 1835. Dutrochet believed in the individuality of cells, i.e., living organisms are made up of a number of individual cells.
So, C is the correct option.
Average thickness of plasmalemma is
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$$0.25 nm/2.5 \overset{o}{A}$$
0%
$$2.5 nm/25 \overset{o}{A}$$
0%
$$0.75 nm/7.5 \overset{o}{A}$$
0%
$$7.5 nm/75 \overset{o}{A}$$.
Explanation
The cell membrane is a phospholipid bilayer that are selectively permeable membranes which separate the interior of the cells (cell organelles and cytoplasm) from the outside environment or the extracellular space.
The cell membrane or plasmalemma is about 7.5–10 nm (75 angstroms
) in thickness which consists of two layers of lipid molecules (bilayer) containing various types of protein molecules.
So, the correct answer is '7.5nm/75 $$A^0$$'
Dense fibrous complex lying adjacent to inner membrane of nuclear envelope is
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Chromatin
0%
Fibrous lamina
0%
Nuclear lamina
0%
Both B and C.
Explanation
The nuclear membrane or karyotheca is a double membrane having pores at intervals.
The nuclear membrane on its inside has a supporting membrane called the nuclear lamina or the fibrous lamina having a uniform thickness.
It is a dense network of fibres present inside the nucleus of cells and are made up of intermediate filaments and membrane-associated proteins.
It provides mechanical support to the nucleus and also regulates DNA replication and cell division
So, the correct answer is 'Both B and C.'
Components of nucleus are
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Karyotheca, nucleolus, chromatin and nucleoplasm
0%
Nuclear envelope, nucleolus
0%
Nuclear envelope, nucleoplasm and chromatin
0%
All the above.
Explanation
The main components of the nucleus are-
1) Nucleolemma or nuclear membrane or karyotheca- is a limiting membrane that
separates the nucleus from the cytoplasm and transports important material between the nucleus and cytoplasm.
2) Nucleolus is a spherical dark structure present inside the nucleus
3) Chromatin is genetic material made of DNA and histone protein
4) Nuclear matrix or nucleoplasm is semifluid homogenous substance
Hence the correct option is A.
Distinction of individual cells is absent in coenoctic organism such as
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Ulothrix.
0%
Volvox.
0%
Escherichia.
0%
Rhizopus.
Cells are autonomous because ___________.
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They synthesise components of living protoplasm from non living materials
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They are able to grow and divided
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Each cell has its own life span
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All of the above
Explanation
Cells are autonomous which means they are self-contained. They are able to carry out their own activities independently for their survival. They are able to synthesis protoplasmic components of a cell from non-living matter such as simple organic compounds. They are able to divide into daughter cells as they are capable of producing energy, exchange of gases, and replication of genetic material required for division. Every such cell has a limited life span as it grows, divides, and then later dies but the other cells surrounding that cell may be in a different state of growth.
Hence, option D is correct.
Autolysis is connected with
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Ribosome
0%
Kinetosome
0%
Lysosome
0%
Golgi apparatus
Explanation
Lysosomes are membrane-bound organelles which contain acid hydrolases or digestive enzymes that digest excess or worn out organelles, food particles, engulfed viruses or bacteria and macromolecules.
They can also digest or damage its own cell causing the cell death which is also known as autolysis, therefore, they are also known as suicidal bags.
So, the correct answer is 'Lysosome'.
Cell organelles having acid hydrolases/digestive enzymes are
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Peroxisome
0%
Lysosomes
0%
Ribosomes
0%
Mesosomes
Explanation
Lysosomes are membrane-bound organelles which are capable of breaking down biomolecules such as proteins, nucleic acids, carbohydrates and lipids.
It helps in digestion and waste removal within a cell.
They contain acid hydrolases or digestive enzymes that digest excess or worn out organelles, food particles, engulfed viruses or bacteria and macromolecules.
So, the correct answer is 'Lysosomes'.
RER is well developed in cells engaged in synthesis of
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Nucleotides
0%
Proteins
0%
Lipids
0%
Secretory products
Explanation
The endoplasmic reticulum (smooth and rough) is an interconnected network of flattened, membrane-enclosed sacs or tube-like structure which are evenly distributed throughout the cytoplasm.
The factory of a cell is known as rough endoplasmic reticulum (studded with ribosomes).
The RER along with the ribosomes manufacture proteins and transport them to other parts of the cell (protein synthesis)
So, the correct answer is 'Proteins'.
E.R. of rapidly dividing cells is _____________.
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Non-functional
0%
Poorly developed
0%
Absent
0%
Highly developed.
Explanation
Endoplasmic reticulum (ER) is a system of membrane-lined channels found in all eukaryotic cells except mature erythrocytes. It constitutes more than 30 to 60 percent of total cell membranes. The endoplasmic reticulum is little or poorly developed in meristematic cells, young dividing cells etc. Membranes of Endoplasmic reticulum are thinner than most other cell membranes.
Nucleus was discovered by
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Purkinje
0%
Nageli
0%
Robert Brown
0%
Hofmeister
Explanation
Correct Option:
C
Explanation:
Robert Brown was a
Scottish life scientist
and paleobotanist who discovered the nucleus and discovered that each and every animal are the
product of cells.
The cell nucleus could be a membrane-shaped structure that consists of a cell's
hereditary statistics
and controls its extension and copy.
It is the
command center
of a organism cell and is typically the foremost notable cell organ in each size and performance.
Hence,
Nucleus
was discovered by
Robert Brown.
Smooth endoplasmic reticulum synthesizes
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Carbohydrates
0%
Proteins
0%
Steroids and lipids
0%
All of the above
Explanation
The endoplasmic reticulum (smooth and rough) is an interconnected network of flattened, membrane-enclosed sacs or tube-like structure which are evenly distributed throughout the cytoplasm.
Smooth endoplasmic is not studded with ribosomes.
Its main function includes- the synthesis of lipids and is also involved in the production of steroid hormones in the adrenal cortex and endocrine glands.
So, the correct answer is 'Steroids and lipids'.
Lysosomes are so called as they have
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Oxidizing enzymes
0%
Digestive enzymes
0%
Respiratory enzymes
0%
Carboxylating enzymes
Explanation
Lysosomes are so called as they have digestive enzymes.
Lysosomes are membrane-bound organelles which are capable of breaking down biomolecules such as proteins, nucleic acids, carbohydrates and lipids.
They contain acid hydrolases or digestive enzymes that digest excess or worn out organelles, food particles, engulfed viruses or bacteria and macromolecules.
They can also digest or damage its own cell causing the cell death (autolysis).
So, the correct answer is 'Digestive enzymes'.
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Practice Class 11 Medical Biology Quiz Questions and Answers
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