Question

Answer in one word or sentence(i) What is the shape of actin molecule?
(ii) What is the chemical nature of troponin and tropomyosin?
(iii) What is meant by recovery stroke of cilia?
(iv) Give an example each of geotropism and phototropism.
(v) Why do we say that vertebrate muscle contraction is energy dependent?

Answer 1

actin is equals to structure

Answer 2

1) The shape of the actin molecule is filamentous and fairly globe-shaped in structure.

2) Troponin regulates the calcium levels, tropomyosin activates the actin to form myosin it will bind in order to stimulate force.

3) Recovery stroke of Cilium returns to the actual position by an adjustable movement.

4) Example of geotropism is the roots of the plant grow into the ground.

An example of phototropism is the roots show gravitropism.

5) They are energy-dependent because muscle contractions are responsible for locomotor and breathing activities.