The PER and TIM Proteins Accumulate During the Day Until

question 44

Multiple Choice

 The PER and TIM proteins accumulate during the day until they cause sleepiness. What prevents them from continuing to accumulate at night?

• A) Metabolic rates increase at night, so proteins are digested faster than they can be synthesized.
• B) The high levels of melatonin present at night react with the proteins to disable them.
• C) The proteins are unstable at the lower body temperatures that are typical at night.
• D) When the proteins reach a high level, they turn off the genes that produce them.

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