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1) Upon activation of G-protein by a receptor-hormone complex: A. G? and GBy sub

ID: 3517081 • Letter: 1

Question

1) Upon activation of G-protein by a receptor-hormone complex: A. G? and GBy subunits dissociate B. Ga-GDP get phosphorylated to form Ga-GTP C. adenylate cyclase enzyme always get activated D. A & O E. None of the above 2) Chromatocytes A. are formed during morphological colour change B. are all excluded from physiological colour change C. refers to only those melanin pigment-containing cells D. A and B E. None of the above 3) An allomone is A. a pheromone that benefits the emitter B. a pheromone that benefits the recipient of this signal C. an allelomone D. a kairomone one of the above

Explanation / Answer

Ans.1.

The choice is. (D).

G alpha subunit dissociate from G beta and gamma subunits which further affect intracellular signlling proteins and target functional protein which depends upon G alpha subunit.

Adenylate cyclase enzyme always gets activated or inhibited by G proteins.

Ans.2.

The choice is. (A)

They are formed during morphological colur change.

It is found on skin and eye to camouflage.

Ans. 3.

The choice is (A)

Allomone benefits the emitter

Allomone affects the behaviuor of other species. It is produced by plants to defend against insects.