Cell: The Unit of Life

Which structures perform the function of mitochondria in bacteria?

1. Nucleoid
2. Ribosomes
3. Cell wall
4. Mesosomes

The motile bacteria are able to move by

1. fimbriae
2. flagella
3. cilia
4. pili.

The solid linear cytoskeletal elements having a diameter of 6 nm and made up of a single type of monomer are known as:

1. Microfilaments
2. Lamins
3. Microtubules
4. Intermediate filaments

The osmotic expansion of a cell kept in water is chiefly regulated by:

1. Vacuoles
2. Plastids
3. Mitochondria
4. Ribosomes

Match the following and select the correct answer :

1. (a) (iv), (b) (iii), (c) (i), (d) (ii)
2. (a) (i), (b) (iii), (c) (ii), (d) (iv)
3. (a) (iv), (b) (ii), (c) (i), (d) (iii)
4. (a) (i), (b) (ii), (c) (iv), (d) (iii)

Pigment containing membranous extensions in some cyanobacteria are

1. pneumatophores
2. chromatophores
3. heterocysts
4. basal bodies.

The Golgi complex plays a major role :

1. as energy transferring organelles
2. in post translational modification of proteins and glycosidation of lipids
3. in trapping the light and transforming it into chemical energy
4. in digesting proteins and carbohydrates

Which one of the following organelle in the figure correctly matches with its function ? [Figure]

1. Golgi apparatus, formation of glycolipids
2. Rough endoplasmic reticulum, formation of glycoproteins
3. Rough endoplasmic reticulum, protein synthesis
4. Golgi apparatus, protein synthesis

A major site for synthesis of lipids is :

1. RER
2. Nucleoplasm
3. SER
4. Symplast

Why is a capsule advantageous to a bacterium?

1. It protects the bacterium from desiccation.
2. It provides means of locomotion
3. It allows bacterium to "hide" from host's immune system.
4. It allows the bacterium to attach to the surface.