The presence or absence of certain sub-cellular components in the cells of three organisms (P, Q and R) is given. Sub-cellular component P Q R Ribosomes present present present Mitochondria present absent present Mitochondria present absent present Lysosomes present absent present Vacuoles many small-sized absent single large-sized P, Q and R could most likely be.

P: E.coli, Q: Paramecium, R: mushroom

P: Spirogyra, Q: Bacillus, R: yeast

Match column I with column II and select the correct option from the codes given below. Column I Column II A. RER (i) Intracellular and extracellular digestion B. SER (ii) Lipid synthesis C. Golgi complex (iii) Protein synthesis and secretion D. Lysosomes (iv) Moves materials out of the cell

$$A - (iii), B - (ii), C - (iv), D - (i)$$

$$A - (ii), B - (iii), C - (iv), D - (i)$$

$$A - (i), B - (iii), C - (ii), D - (iv)$$

$$A - (iv), B - (ii), C - (iii), D - (i)$$

MCQ Questions for Class 11 Medical Biology Cell The Unit Of Life Quiz 12

Lysozome occurs in

0%
Tears
0%
Tears and saliva
0%
Tears, saliva, sweat and mucus
0%
Gastric juice

A plant is kept in dark for few days . The cells of leaves in this plant will show

0%
Amyloplast
0%
Chromoplast
0%
Anthocyanin
0%
Etioplast

Active transport of solutes in a living system is?

0%
Unidirectional
0%
Bidirectional
0%
Multidirectional
0%
Cyclic

The function of lysosome is to ____________________.

0%
Synthesize various cellular macromolecules
0%
Carry out digestion of all cytoplasm components
0%
Ingest material from the extravehicular environment
0%
Recycle cellular material and digest material taken in from the environment

Mitochondria: Definition, History, Position, structure, Functions

The given figure represents ______.

0%
Mitochondria
0%
Plastid
0%
Golgi body
0%
Lysozymes

Name the kinds of cells found in the following places:

0%
Surface of the human skin
0%
Salivery gland
0%
Brain
0%
Inner lining of the wind pipe

Explanation

$\textbf{Solution a: }$

$\bullet$ The tissue found at the outer layer of the skin is Epithelial tissue.

$\bullet$ Epithelial tissue is the thin, protective, and continuous sheet of cells.

$\bullet$ It covers the surface of the body such as the outermost layer of the skin.

$\bullet$ It also covers the inner lining of various body cavities and internal organs such as the mouth, nose, lungs and blood vessels, etc.

$\bullet$ The cells along with the epithelial cells are merkel cells, keratinocytes, melanocytes and Langerhans cells.

$\textbf{Solution b: }$

$\bullet$ The cuboidal epithelium is also found in some glandular ducts such as salivary glands, pancreatic ducts, and some parts of the kidney.

$\bullet$ The Simple cuboidal epithelia are found on the surface of ovaries whereas the cuboidal epithelial cells containing microvilli line the testis.

$\bullet$ It helps in excretion, absorption, secretion and provides mechanical support.

$\textbf{Solution c: }$

$\bullet$ Astrocytes, oligodendrocytes and ependymal cells are cells present in the organ brain.

$\bullet$ Ependymal cells are the type of neuronal support cell (neuroglia) cells.

$\textbf{Solution d: }$

$\bullet$ Ciliated columnar epithelium is the form of columnar epithelium bearing cilia which lines the respiratory tracts, kidney tubules, and oviduct.

$\bullet$ The presence of the cilia in the epithelium allows the rhythmic beating in one direction to move the substance.

$\bullet$ The goblet cells secrete mucin and create a protective mucus layer.

Plastids present in unilluminated cells are

0%
Chloroplast
0%
Chormoplast
0%
Leucoplast
0%
Proplastid

Choose the correct answer from the alternatives given.
Active transport from outside to inside of molecules across a membrane requires:

0%
cyclic AMP
0%
acetyl chlorine
0%
ATP
0%
lecithin

Which one of the following organelles is associated with the hydrolysis of food in a cell?

0%
Ribosome
0%
Lysosome
0%
Golgi body
0%
Centriole

Synthesis of membrane lipids occurs:

0%
Inside of Golgi bodies
0%
In association with endoplasmic reticulum
0%
Inside the nucleus
0%
Inside of mitochondria

Which of the following best distinguishes a prokaryotic cell from a eukaryotic cell?

0%
Prokaryotic cells do not have a membrane-bounded nucleus, but eukaryotic cells do have such a nucleus
0%
Prokaryotic cells have flagella, but eukaryotic cells do not
0%
Prokaryotic cells are much larger than eukaryotic cells
0%
Prokaryotic cells have a cell wall, but eukaryotic cells never do

Cells of all living organisms have a nucleus.

0%
True
0%
False

Which is not true about prokaryotic cell?

0%
They are living cells
0%
They lack a nucleus
0%
They are either archaebacteria or eubacteria
0%
All are parasitic

Which of these is not found in the nucleus?

0%
Nucleoplasm instead of cytoplasm
0%
Functioning ribosomes
0%
Chromatin that condenses to chromosomes
0%
Nucleolus that produces rRNA

Lysosomes function in:

0%
Protein synthesis
0%
Lipid synthesis
0%
Intracellular digestion
0%
Processing and packaging

The endoplasmic reticulum is mainly concerned with:

0%
Proteolysis
0%
Fatty acid synthesis
0%
Cholesterol synthesis
0%
Peptide bond synthesis

The nucleus is not an important site of:

0%
DNA synthesis
0%
RNA synthesis
0%
Synthesis of ribosomal subunits
0%
Protein synthesis

Choose the correct answer from the alternatives given.
If a cell is placed in an isotonic solution, what will occur?

0%
Salts will move into the cell from the surrounding solution
0%
Water will move into the cell from the surrounding solution
0%
Salts will move out of the cell into the surrounding solution
0%
None of the above will occur

State whether the following statements are true or false.
The ability of plasma membrane to engulf macromolecules is known as pinocytosis.

0%
True
0%
False

Which of the following associations is not correct?

0%
Desmosomes-hold cells together to form a flexible sheet of cells in an organ
0%
Tight junctions-between cells serving as barriers
0%
Plasmodesmata-between adjacent plant cells
0%
Gap junctions-between differing types of plasma membranes

State whether the following statements are true or false.
The lipid portion of a plasma membrane acts like a liquid at the temperature of the human body

0%
True
0%
False

According to unit membrane structure, the thickness of plasma membrane is about

0%
$35\overset {\circ}{A}$
0%
$20\overset {\circ}{A}$
0%
$75\overset {\circ}{A}$
0%
$100\overset {\circ}{A}$

Explanation

According to Robertson's concept of unit membrane, the cell membrane is trilaminar. It has a thickness of about

$75\overset {\circ}{A}$ with a central lipid layer of

$35\overset {\circ}{A}$ thick and two peripheral protein layers of

$20\overset {\circ}{A}$ each.

So, the correct answer is '

$75\overset {\circ}{A}$ '.

Select the correct option:

If you remove the fimbriae from the bacterial cell, which of the following would you expect to happen?

0%
The bacteria could no longer swim
0%
The bacteria would not adhere to the host tissue
0%
Transportation of molecules across the membrane would stop
0%
The shape of bacteria would change

Which of the following is the correct representation of organisation levels in living beings?

0%
Subcellular $\rightarrow$ Cellular $\rightarrow$ Individual $\rightarrow$ Community $\rightarrow$ Population
0%
Atomic $\rightarrow$ Molecular $\rightarrow$ Subcellular $\rightarrow$ Cellular $\rightarrow$ Tissue $\rightarrow$ Organ system $\rightarrow$ Individual
0%
Individual $\rightarrow$ Population $\rightarrow$ Organ system $\rightarrow$ Tissue $\rightarrow$ Cellular $\rightarrow$ Molecular $\rightarrow$ Atomic
0%
Atomic $\rightarrow$ Molecular $\rightarrow$ Tissue $\rightarrow$ Individual $\rightarrow$ Ecosystem $\rightarrow$ Community

Gas vacuole, Single envelope system, Cytoskeleton, Non-cellulosic wall, Microfilaments, Cytoplasmic streaming, Lack of cell organelles.

How many of the above features are associated with prokaryotic cell?

0%
Seven
0%
Six
0%
Four
0%
Three

Prokaryotic cells are generally _______ and multiply ________ than the eukaryotic cells.

0%
smaller, slower
0%
larger, slower
0%
smaller, faster
0%
larger, faster

Explanation

Prokaryotic cell is usually small

$(0.1 - 5.0\ \mu m)$ in size whereas eukaryotic cell size is comparatively larger

$(5 - 100\mu m)$ . Prokaryotic cells multiply very rapidly by asexual means like binary fission, sporulation etc.

Hence the correct option is C.

What of the following is true about the genetic material of a prokaryotic cell?

0%
Lacks histones
0%
Not enveloped by nuclear membrane
0%
Composed of a single circular DNA molecule
0%
All of the above

Glycocalyx (mucilage sheath) of a bacterial cell may occur in the form of a loose sheath called ________ or it may be thick and tough called __________.

0%
Capsule, slime layer
0%
Slime layer, capsule
0%
Mesosome, capsule
0%
Mesosome, slime layer

Select the correct option:

Mesosomes are the infoldings of cell membrane, which
(i) are present in both prokaryotic and eukaryotic cells.
(ii) help in cell wall formation, DNA replication and respiration.
(iii) increase the surface area of plasma membrane.

0%
(i) and (ii)
0%
(ii) and (iii)
0%
(i) and (iii)
0%
(i), (ii) and (iii)

As they release hydrolase that digest old and damaged cells, the term suicide bags is aptly used by cell biologists for

0%
Golgi bodies
0%
Lysosomes
0%
Glyoxysomes
0%
Peroxisomes

Which of the following is correct for the origin of lysosome

$(L)$ ?

0%
$ER\rightarrow Golgi\ bodies \rightarrow L$
0%
$Golgi\ bodies \rightarrow ER\rightarrow L$
0%
$Nucleus \rightarrow Golgi\ bodies \rightarrow L$
0%
$Mitochondria\rightarrow ER \rightarrow Golgi\ bodies \rightarrow L$

The smooth endoplasmic reticulum is the major site for synthesis of _________.

0%
Proteins
0%
Lipids
0%
Carbohydrates
0%
Vitamins

............ is directly connected to the outer nuclear membrane.

0%
Mitochondria
0%
Golgi body
0%
ER
0%
Chloroplast

Lysosomes are the reserviors (store houses) of

0%
Hydrolytic enzymes
0%
Oxidative enzymes
0%
Secretory glycoproteins
0%
RNA and proteins

Cell organelle responsible for autolysis is

0%
Dictyosome
0%
Lysosome
0%
Peroxisome
0%
Glyoxysome

Which of the following not represents the features of lysosomes?

0%
A lower pH than the cytoplasm
0%
Reduced hydrolase activity
0%
Double membrane envelope
0%
All of the above

Smooth endoplasmic reticulum is well developed in the cells which synthesises

0%
Steroids
0%
Proteins
0%
Carbohydrates
0%
All of these

How does a cell get rid of defective or malfunctioning organelles by itself?

0%
They are engulfed by plastids and stored until export from cell is possible
0%
Defective parts accumulate until the cell itself dies
0%
They are exported by exocytosis
0%
Lysosomes assist in the removal of defective organelles by digesting them

Lysosomes are _________ vesicular structures formed by the process of packaging in the _________.

0%
Membrane bound, Golgi apparatus
0%
Non-membrane bound, Golgi apparatus
0%
Membrane bound, ER
0%
Non-membrane bound, ER

A piece of liver tissue is homogenized in a laboratory and the homogenate is subjected to sequential centrifugation at increasing speeds (expressed in xg). Centrifugation is used to separate sub-cellular components based on size and density. The steps carried out in the experiment are shown.
Sediments

$1, 2$ and

$3$ would most likely contain.

0%
$1$ : Nuclei, $2$ : Ribosomes, $3$ : Mitochondria
0%
$1$ : Nuclei, $2$ : Mitochondria, $3$ : Lysosomes
0%
$1$ : Lysosomes, $2$ : Mitochondria, $3$ : Nuclei
0%
$1$ : Ribosomes, $2$ : Nuclei, $3$ : Mitochondria

Read the given statements.
(i) Flat membranous sacs in stroma of chloroplasts
(ii) Infoldings in mitochondria
(iii) Disc shaped sacs in Golgi apparatus
Select the correct option as per the codes given above.

0%
$Cristae - (iii), Cisternae - (i), Thylakoids - (ii)$
0%
$Cristae - (i), Cisternae - (ii), Thylakoids - (iii)$
0%
$Cristae - (ii), Cisternae - (iii), Thylakoids - (i)$
0%
$Cristae - (iii), Cisternae - (ii), Thylakoids - (i)$

A lysosome is a membrane-bounded vesicular structure formed by the process of .......in the Golgi apparatus.

0%
Glycosidation
0%
Transformation
0%
Packging
0%
Phagocytosis

Which of the following options is true for a secretory cell?

0%
Golgi apparatus is absent
0%
RER is easily observed in the cell
0%
Only SER is present
0%
Secretory granules are formed in nucleus

The presence or absence of certain sub-cellular components in the cells of three organisms (P, Q and R) is given.

Sub-cellular component	P	Q	R
Ribosomes	present	present	present
Mitochondria	present	absent	present
Mitochondria	present	absent	present
Lysosomes	present	absent	present
Vacuoles	many small-sized	absent	single large-sized

P, Q and R could most likely be.

0%
P: frog, Q: E. coli, R: garlic
0%
P: rat, Q: yeast, R: onion
0%
P: E.coli, Q: Paramecium, R: mushroom
0%
P: Spirogyra, Q: Bacillus, R: yeast

Match column I with column II and select the correct option from the codes given below.

Column I	Column II
A. RER	(i) Intracellular and extracellular digestion
B. SER	(ii) Lipid synthesis
C. Golgi complex	(iii) Protein synthesis and secretion
D. Lysosomes	(iv) Moves materials out of the cell

0%
$A - (iii), B - (ii), C - (iv), D - (i)$
0%
$A - (ii), B - (iii), C - (iv), D - (i)$
0%
$A - (i), B - (iii), C - (ii), D - (iv)$
0%
$A - (iv), B - (ii), C - (iii), D - (i)$

What does

$A, B$ and

$C$ represent in the given figure of a chromosome?

0%
A - Centriole, B - Satellite, C - Primary constriction
0%
A - Centriole, B - Satellite, C - Secondary constriction
0%
A - Centromere, B - Satellite, C - Secondary constriction
0%
A - Centromere, B - Satellite, C - Primary constriction

Mark the mismatched pair.

0%
Amyloplast - Store protein granule
0%
Elaioplast - Store oils or fats
0%
Chloroplasts - Contain chlorophyll pigments
0%
Chromoplasts - Contain colour pigments other than chlorophyll

If you remove the fimbriae from the bacterial cell, which of the following would you expect to happen?

0%
The bacteria could no longer swim
0%
The bacteria would not adhere to the host tissue
0%
Transportation of molecules across the membrane would stop
0%
The shape of bacteria would change

The lipid molecules present in plasma membrane have polar heads and noon-polar tails (as shown in figure).
Which option repreesnts the correct arrangement of lipids in lipid bilayer?

According to unit membrane structure, the thickness of plasma membrane is about ___________.

0%
35 $\mathring {A}$
0%
20 $\mathring {A}$
0%
75 $\mathring {A}$
0%
100 $\mathring {A}$

Explanation

According to Robertson's concept of unit membrane, the cell membrane is trilaminar. It has a thickness of about 75

$\mathring {A}$ with a central lipid layer of 35

$\mathring {A}$ thick and two peripheral protein layers of 20

$\mathring {A}$ each.

CBSE Questions for Class 11 Medical Biology Cell The Unit Of Life Quiz 12 - MCQExams.com

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Practice Class 11 Medical Biology Quiz Questions and Answers

CBSE Questions for Class 11 Medical Biology Cell The Unit Of Life Quiz 12 - MCQExams.com

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Practice Class 11 Medical Biology Quiz Questions and Answers

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