What structures regulate blood flow into capillary beds?

A) Peyer's patches B) venous valves
C) postcapillary sphincters D) precapillary sphincters


Answer: D

Biology & Microbiology

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Which of the following is not one of the major transport systems of the inner mitochondrial membrane?

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Many restriction enzymes generate ____ on

DNA fragments after being cut.

a. frank ends b. blunt ends c. curved ends d. sticky ends e. oblique ends

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Greenhouse gasses act to

a. warm the Earth's surface to support life. b. cool the atmosphere. c. block out ultraviolet radiation. d. contribute to acid rain. e. increase carbon monoxide concentrations.

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Describe a situation in which two aneuploid gametes would yield a euploid zygote

What will be an ideal response?

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