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Mail@liuwenyong.com 在在在在在在 www.liuwenyong.com 在在在在在在在在在在在在在在在,在在在在在在在在在在 temperature, that would be xpected to affect biological activity strongly. Further evidence for persistent as e internal rhythms appears when the usual external cycles are shifted—either experimentally or by rapid eastwest travel over great distances. Typically, the animal's daily internally generated cycle of activity continues without change. As a result, its activities are shifted relative to the external cycle of the new environment. The disorienting effects of this mismatch between external time cues and internal schedules may persist, like our jet lag, for several days or weeks until certain cues such as the daylight/darkness cycle reset the organism's clock to synchronize with the daily rhythm of the new environment.
4. The word persistent in the passage is closest in meaning to
5. Which of the sentences below best expresses the essential information in the highlighted sentence n the i
passage? Incorrect choices change the meaning in important ways or leave out essential information.
○Stability, a feature of the biological clock's period, depends on changeable factors such as temperature.
○A major feature of the biological clock is that its period does not change despite significant changes in the environment.
○A factor such as temperature is an important feature in the establishment of the biological clock's period.
○Biological activity is not strongly affected by changes in temperature.
6. According to paragraph 2, which of the following is true about the circadian periods of animals deprived of environmental cues?
○They have the same length as the daily activity cycles of animals that are not deprived of such cues.
○They can vary significantly from day to day.
○They are not the same for all members of a single species.
○They become longer over time.
7. According to paragraph 2, what will an animal experience when its internal rhythms no longer correspond with the daily cycle of the environment?
○Change in period of the internal rhythms
○Reversal of day and night activities Increased
○Sensitivity to environmental factors
8. In paragraph 2, the author provides evidence for the role of biological clocks by
○listing the daily activities of an animal's cycle: sleeping, feeding, moving, reproducing, metabolizing, and producing enzymes and hormones
○describing the process of establishing the period of a biological clock
○presenting cases in which an animal's daily schedule remained stable despite lack of environmental cues
○contrasting animals whose daily schedules fluctuate with those of animals whose schedules are constant
9. The word duration in the passage is closest in meaning to
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10. In paragraph 2, why does the author mention that the period for different horseshoe crabs ranges from 22.2 to 25.5 hours?...
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This note was uploaded on 09/17/2013 for the course LANGUAGE 13DL208 taught by Professor Wang during the Fall '13 term at East China Normal University.
- Fall '13