Animals exhibit daily rhythms in their behavior and physiology. Which of the following statements about circadian rhythms is false?
A) In mammals, the master circadian "clock" is located in the suprachiasmatic nuclei of the brain.
B) A circadian clock can be entrained by environmental cues.
C) Free-running circadian clocks are seldom exactly 24 hours long.
D) Genetic mutations can cause changes in the length of the free-running circadian clock.
E) Animals that are active at night do not display circadian rhythms.

Question

Quizplus · Accepted Answer

This statement is false. Animals that are active at night, such as nocturnal species, do display circadian rhythms. Their rhythms are simply shifted to align with their nighttime activity instead of being aligned with daylight activity patterns.

Animals Exhibit Daily Rhythms in Their Behavior and Physiology