Animals Exhibit Daily Rhythms in Their Behavior and Physiology

question 49

Multiple Choice

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.

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Large submarine elevations lying above the abyssal plains of the ocean, created by volcanic activity or large-scale uplift.

Basalt

A dark, fine-grained volcanic rock that forms from the rapid cooling of basaltic lava, composing much of the ocean floor and volcanic islands.

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The process of identifying a problem, developing potential solutions, and implementing a course of action to resolve the problem.