By controlling their musculature, which of the following can vary the resistance to blood flow?
a. arteries
b. veins
c. capillaries
d. arterioles
e. venules
D
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In the respiratory tract, ciliated cells constantly sweep mucus that contains trapped foreign matter
a. True b. False
What was the immediate cause of the end-Cretaceous extinction event?
a. a gamma-ray burst b. rising sea levels c. an asteroid impact d. increased sunspot activity
Which method is used to prevent hemolytic newborn disease?
a. EPO injections b. Rh transfusions c. Rh antibody injections d. cross-matching e. RhoGam injections
Under high tryptophan conditions, tryptophan binds to and activates the repressor protein, thereby blocking
transcription of the trp operon. This is an example of: a. protein degradation. b. negative control of inducible genes. c. negative control of repressible genes d. positive control of inducible genes. e. positive control of repressible genes.