Suppose 1 molecule of hormone X activated 10 G proteins, each G protein activated 10 adenylate cyclase molecules, each adenylate cyclase made 1,000 cAMP molecules, and each cAMP activated 1,000 enzyme molecules. This would be a case of

a. a synergistic effect.
b. hypersecretion.
c. up-regulation.
d. enzyme amplification.
e. negative feedback inhibition.


Ans: d. enzyme amplification.

Anatomy & Physiology

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