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

Biology & Microbiology

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In the respiratory tract, ciliated cells constantly sweep mucus that contains trapped foreign matter

a. True b. False

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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

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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

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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.

Biology & Microbiology