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Biological clocks are physiological systems that enable organisms to live in harmony with the rhythms of nature, such as the cycles of day and night and of the seasons. Such biological "timers" exist for almost every kind of periodicity throughout the plant and animal world, but most of what is known about them comes from the study of circadian, or daily, rhythms. Circadian rhythms cue typical daily behavior patterns even in the absence of external cues such as sunrise, demonstrating that such patterns depend on internal timers for their periodicity. No clock is perfect, however. When organisms are deprived of the hints the world normally provides, they display a characteristic "free-running" period of not quite 24 hours. As a result, free-running animals drift slowly out of phase with the natural world. In experiments in which people are is A. (A) stones B. (B) plants C. (C) animals D. (D) human beings 查看答案 更多"Biological clocks are physiological"的相关试题: [单项选择] Biological clocks are physiological systems that enable organisms to live in harmony with the rhythms of nature, such as the cycles of day and night and of the seasons. Such biological "timers" exist for almost every kind of periodicity throughout the plant and animal world, but most of what is known about them comes from the study of circadian, or daily, rhythms. Circadian rhythms cue typical daily behavior patterns even in the absence of external cues such as sunrise, demonstrating that such patterns depend on internal timers for their periodicity. No clock is perfect, however. When organisms are deprived of the hints the world normally provides, they display a characteristic "free-running" period of not quite 24 hours. As a result, free-running animals drift slowly out of phase with the natural world. In experiments in which people are is A. (A) free-running B. (B) rewinding the clock C. (C) light D. (D) changing the temperature 查看答案 [填空题]Fishes’ structural and physiological adaptations for life at extremes are still waiting for ______. 查看答案 [填空题]According to physiological theories, dreaming allows us to sort through problems or events of the day that require our attention. 查看答案 [单项选择] Natural selection describes the biological process in which the differences of individuals within a population influences their abilities to survive and reproduce in an environment. The differences in individuals is a result of their genetic inheritance from their parents. In a population, any characteristic which blocks reproduction success tends to decrease generation by generation. In time, the ill-adapted die out. On the other hand,the individuals who do survive and reproduce will tend to produce offspring which are better adapted to the environment. Natural selection tends to promote adaptations that will increase the organism’s ability to survive in an environment. Natural selection can serve to stabilize a population if the new traits, called mutations, are eliminated when they appear because they are not as well-adapted to the environment. The opposite effect is obtained when a new trait is introduced which allows individuals to adapt better over time, the s A. they have different success generation by generation B. they are ill-adapted and eventually die out C. they have different genetic inheritances D. they want to survive and reproduce successfully 查看答案 [填空题]Biological control entails using synthetic chemicals to try and change the genetic make-up of the pests’ offspring. 查看答案 [单项选择]Passage OneWhen did watches and clocks become common in the United States A. From the 1850s. B. From the 1700s. C. From the 1800s. D. From the 1900s. 查看答案 [单项选择]　　　 What unusual or unique biological train led to the remarkable diversification and 　　　 unchallenged success of the ants for ever 50 million years The answer appears to be 　　　 that they were the first group of predatory ensocial insects that both lived and foraged 　　　 primarily in the soil and in rotting vegetation on the ground. Eusocial refers to a form (5) of insect society characterized by specialization of tasks and cooperative care of the 　　　 young; it is rare among insects. Richly organized colonies of the land made possible 　　　 by eusociality enjoy several key advantages over solitary individuals. 　　　 Under most circumstances groups of workers arc better able to forage for food and 　　　 defend the nest, because they can switch from individual to group response and back (10) again swiftly and according to need. When a food object or nest intruder is too large for 　　　 one individual to handle, nestmates can be quickly assembled by alarm or recruitment A. a logical conclusion B. the next step in a senes of steps C. a reason for further study D. the relationship among ants 查看答案 我来回答: 提交 最新试题 ●    [单选题]焊接时，产生和维持( )的必要条件是阴极电子发射和气体电离。 ●    [单选题]王某，女，39 岁，患肺炎，体温持续 39℃以上，医嘱为生理盐水大量不保留灌肠降温，灌肠过 ●    [判断题]在带电作业过程中如设备突然停电，工作负责人应尽快与调控人员联系，值班调控人员与工作许可人取 ●    [单选题]下列关于施工现场主要材料半成品的堆放的叙述,不正确的是( )。 ●    [判断题]（ ）在有砟桥上，护轨与基本轨头部间净距为500mm。 ●    [单选题]当电气火灾发生时,应首先切断电源再灭火,但当电源无法切断时,只能带电灭火,500V低压配电 网站地图 我要搜题网  版权所有  ©2024  湘ICP备18016427号   购买搜题卡查看答案 [会员特权] 开通VIP， 查看 全部题目答案 [会员特权] 享免全部广告特权 推荐91天 ¥36.8 ￥80元 31天 ¥20.8 ￥40元 365天 ¥88.8 ￥188元 请选择支付方式 微信支付 支付宝支付 点击支付即表示同意并接受了《购买须知》 立即支付 系统将自动为您注册账号 已有账号登录 找回账号密码 请使用微信扫码支付 订单号： 截图扫码使用小程序[完全免费查看答案] 前往小程序 请不要关闭本页面，支付完成后请点击【支付完成】按钮 支付完成 取消支付 恭喜您，购买搜题卡成功 系统为您生成的账号密码如下： 账号 密码 重要提示：请拍照或截图保存账号密码！ 我要搜题网官网：https://www.woyaosouti.com 我已记住账号密码