What are plasmids? Describe their role in bacteria.

3

(a)

Give the biochemical composition of the plasma membrane.How are lipid molecules arranged in the membrane?

3

(a)

The lysosomal enzyme does not destroy the cell's own cytoplasm.why?

3

(a)

State the chief functions of mitochondria.

3

(a)

In what respect the mitochondria and plastids resemble the bacteria.

3

(a)

Fill in the blanks at A, B, and C as shown in diagram

3

(a)

Both lysosomes and vacuoles are endomembrane structures, yet they differ in terms of their functions. Comment.

3

(a)

Describe passive transport, osmosis and active transport in plasma membrane.

3

(a)

Give a brief description of ribosomes.

3

(a)

What is the benefit of cell walls, in plant cells?

3

(a)