Which one of the following is TRUE regarding baroreceptors?
A) Baroreceptors are pressure sensors that monitor blood pressure.
B) Baroreceptors are located in the right atrium and right ventricle.
C) Baroreceptors respond to high blood pressure by causing an increase in heart contraction.
D) Baroreceptors respond to low blood pressure by causing vasodilation of the arterioles.
E) Baroreceptors send nerve impulses directly to the heart.
A
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In response to the presence of extracellular antigen, B cells rapidly proliferate and the immunoglobulin M (IgM) proteins produced are soluble rather than anchored in the membrane.This change in IgM protein state is due to:
A. the cleavage of several hydrophobic amino acid residues from the IgM protein. B. the differential expression of two different IgM genes. C. the predominant use of the first 3' end cleavage site of the IgM pre-mRNA. D. inclusion of the M exon in mature IgM mRNA.
During hydrolysis of ATP, it loses a(n) ________, which results in an increase in entropy.
Fill in the blank(s) with the appropriate word(s).
Events X and Y are independent of each other. If the probability of event X occurring is 1 in 4, and the probability of
event Y occurring is 1 in 5, the probability of both events occurring is ____.
a. (1/4)2 + (1/5)2 = (1/16) + (1/25) = (25/400) + (16/400) = 41/400 b. (1/4) + (1/5) = (5/20) + (4/20) = 9/20 c. (1/4)2(1/5)2 = (1/16)(1/25) = 1/400 d. (1/4)(1/5) = 1/20 e. (1/4 + 1/5)2 = (5/20 + 4/20)2 = (9/20)2 = 81/400
The source of the atmospheric oxygen necessary for the development of oxidative metabolism is thought to have been
a. glycolysis. b. the big bang. c. the breakdown of ATP. d. photosynthesis.