As per and tim proteins degrade over time,
A) the Clock protein is inhibited, leading to greater production of per and tim.
B) the Clock protein is activated, leading to greater production of per and tim.
C) more melatonin is released by the pineal gland, leading to greater production of per and tim.
D) the SCN is inhibited, leading to less production of per and tim.

Question

Quizplus · Accepted Answer

The Clock protein, along with Cycle, activates the transcription of per and tim genes. As PER and TIM proteins degrade, this reduces their inhibition on the Clock-Cycle complex, leading to its activation and thus greater production of PER and TIM proteins, maintaining the circadian rhythm cycle.

As Per and Tim Proteins Degrade Over Time