Which of the following is incorrectly paired?
a. nerve net—simple nervous system common in radially symmetrical animals
b. CNS—consists of the spinal column and brain
c. interneurons—portion of the peripheral nervous system that integrates signals
d. spinal column—protects the spinal cord
C
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Four of the five answers listed below belong to the same category of structures. Select the exception
a. blastocyst b. amnion c. allantois d. yolk sac e. chorion
Genes that are exchanged between prokaryotes are contained in ____ molecules
a. pili b. plasmid c. prokaryotic RNA d. nuclear e. protein
Enzyme activity may be affected by
a. temperature. b. the presence of chemicals that fit into allosteric sites. c. feedback inhibition. d. metabolic conditions in the cell. e. all of these.
A population of mountain goats are split because of the formation of a glacier. After 500 years the glacier melts and the two goat populations are free to move between the two areas. Under what conditions might a hybrid zone occur?
A. Post-zygotic isolating mechanisms have arisen. B. Pre-zygotic isolating mechanisms have arisen. C. Gene flow between the two populations does not occur. D. Both pre- and post-zygotic isolating mechanisms have arisen. E. Reproductive isolation is incomplete.