Question

What are the answers to multiple choice questions 6-9? All the questions are provided.

1 point 6. What is the single-most defining characteristic of a true biological rhythm? O a. It can be entrained by environmental cues. O O b. It is self-sustaining. d. All true biological rhythms are circadian. 7. Which region of the mammalian brain is viewed as the master 1 point clock that organizes all circadian rhythms? O a. Suprachlasmatic nucleus (SCN) O b. Hippocampus O c. Pineal gland O d. Preoptic area (POA) of the hypothalamus 1 point 8. A male and female rat each has free-running circadian rhythms shorter than the normal 24 hours. Their offspring will most likely have a a shorter cycle (< 24 hours) as well, indicating that circadian rhythms have a strong genetic component. b. normal cycle (24 hours), indicating that zeitgebers have the strongest influence on cycle length. c. longer cycle > 24 hours), indicating that circadian rhythms have a strong genetic component. d. longer cycle > 24 hours), indicating that zeitgebers have the strongest influence on cycle length. 1 point 9. Which of the following is evidence that the suprachiasmatic nucleus is a master clock? a. Cells from the SCN maintain circadian rhythms of electrical activity when isolated in culture. b. Cells from the SCN each display different free-running rhythms O of electrical activity. c. Lesioning of the SCN completely and permanently disrupts circannual rhythms. O d. Lesioning of the SCN does not disrupt circannual rhythms.

Answer 1

6. B - it is self sustaining.

7. A - suprachiasmatic nucleus SCN

8.B

9. C

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