Blood enters the kidney through the ____ and leaves the kidney through the ____
a. renal vein; renal artery
b. nephron; renal capillary
c. renal artery; renal vein
d. renal artery; nephron
e. nephron; renal artery
ANSWER: c
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In the case of temperature regulation, integration is accomplished by
(a) a receptor in the brain. (b) a center in the brain. (c) muscles and glands. (d) none of the above.
The starting point for the ovarian cycle is a
a. primary oocyte arrested in meiosis I. b. primary oocyte arrested in meiosis II. c. primary oocyte having just completed meiosis I. d. secondary oocyte arrested in meiosis I. e. secondary oocyte arrested in meiosis II.
Which of the following is not a characteristic of fungi?
a. membrane-bounded nuclei b. mitochondria c. cell wall of lipopolysaccharides d. primarily terrestrial in habitat e. reproduction via spores
The occurrence of an RNA world early in the history of life can never be proven, but experiments with _____ have
shown that it is feasible. a. in vitro evolution b. Darwin’s evolution c. indirected evolution d. chemical evolution e. biological evolution