本题目来源于试卷: Interaction & Interdependence C.1 Enzymes & Metabolism，类别为 IB生物学
[单选题]
What is a characteristic that separate*:6,s3d rcu buhz ltlg3 ,hs+mib6; dus mammals or e n*4vgpqh n *wex+az+c gfc i1y4hb4*3ndotherms from ectotherms that have fluctuating body temperatur4h3cah ipb4gw+*qfzv nxe** 1yg+4n ces?
A. They are able to absorb heat from external sources to maintain their body temperatures.
B. They use the heat generated from metabolic processes in their bodies to maintain their body temperature above a set lower limit.
C. They have a very efficient metabolism that does not release much waste as heat energy.
D. They can survive without eating for longer periods because they do not depend on metabolising what they eat.
参考答案: B
本题详细解析:
Endotherms tend to have a more consistent and higher baselinc86h* p4 ; tr09 feznwuvdb(ewe metabolic rate than ectotherms. Metabolic reactions are not very efficient and so energy is dissipated as heat, therefore, Choice C is incorrect. Endotherms use the heat * 8cewhb ;0frun4ed vw6ptz 9(released to maintain their body temperature above a lower set limit, therefore Choice B is correct.
Both ectotherms and endotherms absorb heat from external sources. However, ectotherms rely on this heat to maintain their body temperature as they cannot maintain their own body temperature (Choice A).
It’s the ectotherms that can survive for long periods without eating (Choice D) as they are not dependent on metabolising what they eat to generate heat. They also tolerate variations in internal temperatures better than endotherms.
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