11 Jun Washington BIOLOGY 220 – The mammal master biological clock
Question
1.The mammal master biological clock is (choose all the apply):
found in a region of neurons called the suprachiasmatic nuclei (SCN) in the hypothalamus of the brain
regulates sleep, metabolism, and hormone production
responds to external cues such as light and darkness
are asynchronous with “local” clocks that sit in organs
2. Most organisms have a circadian clock that is exactly 24 hours long, like the day/night cycle of the earth.
True
False
3. Which of the following are true about the molecular biology of the mammalian circadian clock? (Choose all the apply.)
PER and CRY proteins interfere with the production of more PER and CRY protein.
PER and CRY proteins are made but there is a delay before they start functioning (as transcription inhibitors of the per and cry genes)
The function of circadian clock genes and proteins is an example of negative feedback
The function of circadian clock genes and proteins is an example of positive feedback
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