Which of the following statements concerning homeostasis in body temperature is NOT true? The body reacts to
A. heat by constricting the blood vessels in the skin.
B. heat by stimulating the sweat glands.
C. cold by contracting skeletal muscles in shivering.
D. cold by rerouting blood away from the skin.
E. All of the statements are not true.
Answer: A
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Refer to the accompanying figure. In every case, caterpillars that feed on oak flowers look like oak flowers. In every case, caterpillars that were raised on oak leaves looked like twigs. These results support which of the following hypotheses?
A) The longer day lengths of summer trigger the development of twig-like caterpillars. B) Differences in air pressure, due to elevation, trigger the development of different types of caterpillars. C) Differences in diet trigger the development of different types of caterpillars. D) The differences are genetic. A female will either produce all flowerlike caterpillars or all twig-like caterpillars. A) The longer day lengths of summer trigger the development of twig-like caterpillars. B) Differences in air pressure, due to elevation, trigger the development of different types of caterpillars. C) Differences in diet trigger the development of different types of caterpillars. D) The differences are genetic. A female will either produce all flowerlike caterpillars or all twig-like caterpillars.
Telomere sequences:
A. act as binding sites for kinetochore proteins. B. are AT-rich sequences found at the ends of linear chromosomes. C. include short repeats that are repeated more than 1,500 times in mammals. D. are required for naturally occurring, but not artificial, chromosomes. E. also often serve as origins of replication.
The bones and cartilage in animals serve the same function as ________ in plants?
A. xylem B. leaves C. wood D. capillaries E. phloem
How do endotherms and ectotherms derive most of their body heat?
A. Both ectotherms and endotherms derive most of their body heat through their environment. B. Ectotherms derive most of their body heat through their environment, while endotherms derive most of their body heat through metabolic processes. C. Both ectotherms and endotherms derive most of their body heat through metabolic processes. D. Ectotherms derive most of their body heat through metabolic processes, while endotherms derive most of their body heat through their environment E. Ectotherms derive most of their body heat through their fur, while endotherms derive most of their body heat through insulating scales.