Question

Assertion: Eukaryotic cells have the ability to adopt a variety of shapes and carry out directed movements.

Reason: There are three principal types of protein filaments microfilaments, microtubules and intermediate filaments, which constitute the cytoskeleton.

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true but R is not correct explanation of A

(c) A is true but R is false

(d) A and R are false

Answer 1

The correct option is: (a)

Explanation:

The cytoskeleton is a fibrous or fine tubular structure which constitute the supportive structures of the cell. It is a dynamic structure that maintains cells shape, enables some cell motion and plays important role in both intra-cellular transport and cell division. The cytoskeleton is made up of three elements within the cell. They are - microtubules (made up of tubulin protein), microfilaments (made up actin) and intermediate filaments (made up of structural proteins e.g., keratin, vimentin and desmin).