Which of the following statements regarding cilia is not correct ?

1. The organized beating of cilia is controlled by fluxes of Ca²⁺ across the membrane

2. Cilia are hair-like cellular appendages

3. Microtubules of cilia are composed of tubulin

4. Cilia contain an outer ring of nine doublet microtubules surrounding two single

microtubules

Which one of the following phenomena is commonly referred as 'cell drinking?

1. Endocytosis

2. Exocytosis

3. Phagocytosis

4. Pinocytosis

If a chloroplast of plant is isolated and studied in a test tube the investigation is described

as

1. in vivo

2. in vitro

3. in situ

4. none of these.

An organelle present in all plant cells but absent from those of animals is

1. Mitochondria

2. peroxisome

3. glyoxysomes

4. Centrioles

Primary cell wall consists of a loose network of cellulose microfibrils impregnated with a

matrix of

1. glycoprotein and flavoprotein

2. hemicellulose and flavoprotein

3. hemicellulose and pectin

4. flavoprotein and pectin.

Which of the following is not a true subcellular organelle ?

1. Peroxisome

2. Ribosome

3. Chloroplast

4. Lysosome.

Golgi body is associated with

1. packaging and storage of material

2. cell wall formation

3. transport of enzyme

4. all of the above

Which of the following cytoskelelal components of an eukaryotic cell play a major role in

protoplasmic streaming?

1. Microtubules

2. microfilaments

3. Intermediate filaments

4. None of these

Free radicals in our body have been implicated in

1. ageing

2. certain degenerative disorders

3. neurodegeneration

4. all the above

Which is not true for prokaryotic cells ?

1. They are smaller than eukaryotic cells.

2. They lack membrane-bound organelles.

3. Their genetic material is localised within nucleoid.

4. They contain a well developed cytoskeleton.