Which of the following is not involved in body temperature homeostasis?
A. the hypothalamus
B. secretion by sweat glands
C. shivering
D. constriction or dilation of blood vessels
E. respiration rate
Answer: E
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Circular DNA molecules found in nature (such as bacterial, viral, or mitochondrial DNA) are
A) positively supercoiled. B) negatively supercoiled. C) not supercoiled, due to their small size. D) always oriented in a triple helix to conserve space. E) always in the relaxed state.
How do corals react when water temperatures are too high?
A. They migrate to areas with lower water temperatures. B. They slow down their shell-building processes. C. They expel their symbiotic algae. D. They reproduce in large numbers. E. They produce more pigment.
When the rodenticide warfarin was first introduced, rats were very susceptible to it. The development of resistance to
warfarin by rats was the result of a. special creation. b. natural selection of individuals that expressed genes for resistance. c. the high biotic potential of insects. d. a naturally occurring example of inheritance of acquired characteristics. e. mutation induced by DDT.
The process of using just enough heat to kill most (but not all) of the bacteria that cause spoilage in a beverage was developed by
a) Pasteur. b) Ehrlich. c) Lister. d) Koch.