Which of the following is true about dictyosomes

  • Golgi body of plant

  • It helps in cell plate formation

  • It helps in formation of acrosome

  • All of these

The size of Pleuropneumonia - like Organism (PPLO) is :

  • 0.02 μm

  • 1-2 μm

  • 10-20 μm

  • 0.1 μm

During Grams' staining which is incorrect?

 

 

  • All bacteria take crystal violet stain

  • Gram +ve bacteria take crystal violet stain

  • Only Gram –ve bacteria take crystal violet stain

  • Gram –ve bacteria lose this stain after alcohol

Hammerling's experiments on Acetabularia involved exchanging

  • Cytoplasm

  • Nucleus

  • Rhizoid and stalk

  • Gametes 

A non-membrane bound organelle found exclusively in animal cells is:

 

  •  Sphaerosome

  • Glyoxisome

  • Peroxisome

  • Centriole

Which of the following is the largest constituent of the membrane of the
erythrocyte in human beings and is also responsible for performing most of the functions of the membrane?

1.Proteins

2.Lipids

3.Glycolipids

4.Glycoproteins
  • 1
  • 2
  • 3
  • 4

Cell is the fundamental structural and functional unit of all living organisms because:

  • Anything less than a complete structure of a cell does not ensure independant living.

  • The metabolic reactions can only occur inside a living cell.

  • Nucleic acids present in the cells ensure living state.

  • The membrane bound organelles cause differentiation for proper functioning.

Who concluded, based on his studies on plant tissues, that the presence of cell wall is a unique character of plant cells ?

  • Mathias Schleiden

  • Theodore Schwann

  • Rudolph Virchow

  • Robert Hooke

Mesosomes in prokaryotes do not help in:

  • Cell wall formation

  • DNA replication

  • Respiration

  • Photosynthesis

The endomembrane system of a eukaryotic cell does not include:

  • Endoplasmic reticulum

  • Lysosome

  • Vacuole

  • Peroxisome

The cis and trans faces of the Golgi Apparatus are:

  • Similar but not interconnected

  • Similar and interconnected

  • Entirely different but interconnected

  • Entirely diffrent and not interconnected

Plastids used in storing proteins are called as:

  • Amyloplasts

  • Aleuroplasts

  • Elaioplasts

  • Chromoplasts

A centriole-like structure, from which the cilium and the flagellum emerge, is the:

  • Centrosome

  • Basal body

  • Axoneme

  • Vimentin

Which of  the following is true about mitochondria except

  • Semi-autonomous organelle

  • Compartmentalisation is present

  • Matrix contain 80s ribosomes

  • Both A and B

The outer membrane of the nucleus:

I. is continuous with the Endoplasmic reticulum

II. does not bear ribosomes.

  • Only I is correct

  • Only II is correct

  • Both I and II are correct

  • Both I and II are incorrect

If the centromere is situated close to the end of a chromosome, it is called as:

  •  Metacentric

  • Submetacentric

  • Acrocentric

  • Telocentric

Centrioles, cilia, flagella, and basal bodies have remarkably similar structural elements and arrangements. This leads us to which of the following as a probable hypothesis?

  • Disruption of one of these types of structure should necessarily disrupt each of the others as well.

  • Loss of basal bodies should lead to loss of all cilia, flagella, and centrioles.

  • Motor proteins such as dynein must have evolved before any of these four kinds of structure.

  • Natural selection for motility must select for microtubular arrays in circular patterns.

The presence of cholesterol in the plasma membranes of some animals.

  • enables the membrane to stay fluid more easily when cell temperature drops.

  • enables the animal to remove hydrogen atoms from saturated phospholipids.

  • enables the animal to add hydrogen atoms to unsaturated phospholipids.

  • makes the membrane less flexible, allowing it to sustain greater pressure from within the cell.

Prokaryotic cells have something unique in the form of:

  • Inclusion bodies

  • Plasmids

  • Cell wall

  • 70 S ribosomes

Gas vacuoles allow cyanobacteria to:

  • Store carbon dioxide for assimilation

  • Control their buoyancy

  • Provide anaerobic conditions to nitrogenase

  • Eliminate toxic ammonia

The lipid component of the plasma membrane mainly consists of:

  • Triglycerides

  • Cholesterol

  • Phosphoglycerides

  • 4 Proteins

Carotenoid pigments are found in:

I. Chloroplasts

II. Chromoplasts

III. Leucoplasts

  • Only I

  • Only I and II

  • Only II

  • I, II and III

Microbodies, which help to convert stored lipids into carbohydrates so they can be used for plant growth, are known as:

 

  • Peroxisomes

  •  Sphaerosomes

  • Glyoxysomes

  • Lysosomes

Ribosomes are produced in

  • Nucleolus

  • Mitochondria

  • Cytoplasm

  • Golgibody

All the following are the part of a eukaryotic cell endomembranous system except:

  • Vacuole

  • Lysosome

  • Golgi complex

  • Mitochondria

A feature unique to prokaryotes would be:

  • A cell wall not made up of cellulose

  • An extrachromosomal plasmid DNA

  • A cell membrane of peptidoglycan

  • Presence of inclusions

Chromatophores are:

  • present in liopolysaccharide layer of gram negative bacteria

  • colored pigments present in fluorescent bacteria

  • vesicles that store pigments in prokaryotic cells

  • extensions on membrane in cynobacteria 

The tail of the phospholipid molecule:

  • is hydrophilic and composed of phosphate

  • is hydrophilic and composed of saturated hydrocarbons

  • is hydrophobic and composed of saturated hydrocarbons

  • is hydrophobic and composed of unsaturated hydrocarbons

In animal cells, lipid-like steroidal hormones are synthesized in the:

  • Nucleus

  • Rough endoplasmic reticulum

  • Smooth endoplasmic reticulum

  • Golgi apparatus

Unless specifically stained by a vital stain like Janus Green, which of the following will not be visible under a microscope?

  • Rough endoplasmic reticulum

  • Smooth endoplasmic reticulum

  • Golgi apparatus

  • Mitochondria

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