Which of the following statements about the sympathetic and parasympathetic nervous systems is
true?
a. The sympathetic system controls external stimuli, while the parasympathetic system
controls internal stimuli.
b. The sympathetic system typically stimulates organ activity, while the parasympathetic
system typically inhibits it.
c. The sympathetic system is under voluntary control, while control of the parasympathetic is
involuntary.
d. Both nervous systems stimulate the activities of many organs.
e. Both release the neurotransmitters serotonin and acetylcholine
B
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a. erythropoietin b. hemoglobin c. insulin d. erythrocytes e. leucocytes
The long extension of a cell that can propel a cell forward by whipping back and forth (such as human sperm) is called a ________
A) vesicle B) flagellum C) pilus D) cilium
Biologists are studying two species whose DNA is known to differ by 10%. Which information would be least important in calibrating a molecular clock to determine how rapidly evolution has proceeded with these two species?
A) the fossil record of these two species B) a geological event that separated the species at a particular time C) the function of each of these regions of DNA D) the time of divergence of closely related species
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A) It agrees with available evidence and all alternative hypotheses have been ruled out. B) It cannot be rejected. C) It has been absolutely proven. D) It does not need to be altered in the light of new evidence.