Strands of protein that help stop substances from leaking across a tissue are called
a. gap junctions.
b. adhering junctions.
c. intercalated discs
d. tight junctions.
e. desmosomes
D
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Currently, the human population of the world
A. has reached its carrying capacity. B. is stable. C. is declining in much of the world. D. is increasing rapidly.
The use of a proxy variable changes how you must interpret which of the following statistics?
A. P-value of coefficient on treatment B. Standard errors on treatment C. R-squared D. None of the answers is correct.
If a physician hears two "lub" sounds instead of one, then which of the following conditions is true?
a. The semilunar valves are not closing simultaneously. b. The atrial blood is flowing backward and causing the extra sound. c. The atrioventricular valves are not closing at the same time. d. The AV and semilunar valves are not closing at the same time. e. No such double sound has ever been heard.
Which part of the genome is affected by cancer-causing alterations to cellular DNA?
a) Introns. b) Oncogenes. c) Exons. d) Promoters.