問題詳情

請依下文回答第 28 題至第 32 題During the mid-1900s, scientists began to examine biological cycles in several different organisms. By the early1960s, they showed that daily, or circadian, rhythms—“circa” meaning around and “dia” day—are generatedinternally and synchronized to the 24-hour day. How are these cycles generated and altered?In mammals, including humans, a biological clock resides in a region of the brain’s hypothalamus, a quarter-sizedstructure that regulates hormone levels and plays a role in emotions. In some insects and snails the clocks are usuallylocated in the retina of the eye. In birds the clocks can also be found in a brain region called the pineal gland or in thehypothalamus.The clocks are almost always linked to some form of light-sensing cell called a photoreceptor. This type of cellresponds to sunlight in ways that help synchronize the clock with the 24-hour day.Scientists have learned that exposure to light at certain times in the internal cycle can reset the clock in animals.In mammals, light turns on important genes and affects sleep patterns, alertness, and body temperature. In nature, thislight sensitivity helps organisms synchronize their clock within the cycle of day and night.Researchers have found that exposure to strong artificial light at certain times can reset the clock in ways thatrelieve insomnia, jet lag, and mental disorders. Light at the wrong time of the internal cycle, however, might contributeto or intensify these conditions.
28 According to the passage, in which of the following organs can a mosquito’s biological clock be found?
(A) Brain
(B) Eye
(C) Nose
(D) Tongue

參考答案

答案：B
難度：適中0.630435
統計：A(14),B(29),C(1),D(0),E(0)

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