Biological clocks cause organisms to perform daily activities on a regular basis. Which of the following is a False statement about this kind of "circadian rhythm"?
A)It may have the same signal transduction pathway in all organisms.
B)It must be reset on a daily basis.
C)It may help to cause photoperiodic responses.
D)Once set, it is independent of external signals.
E)The exact mechanism of biological clocks remains unknown.

Question

Quizplus · Accepted Answer

Circadian rhythms are reset by environmental cues such as light and temperature, so they are not independent of external signals. The other statements are true: circadian rhythms may have a similar signal transduction pathway in different organisms, they may play a role in photoperiodic responses, and the exact mechanism of biological clocks is still not fully understood.

Biological Clocks Cause Organisms to Perform Daily Activities on a Regular