Which type of cell protects the skin from UV light damage?
a. melanocytes
b. Granstein cells
c. keratinocytes
d. Langerhans cells
e. squamous cells
ANSWER: a
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The most common leukocyte in the blood is
(a) a lymphocyte. (b) an eosinophil. (c) a basophil. (d) a neutrophil.
In the mammalian nephron, blood flows into a specialized capillary network called the ______________, and components of the blood plasma are filtered out.
A. Bowman's capsule B. glomerulus C. protonephridium D. loop of Henle
Halobacterium salinarum and some other haloarchaea synthesize bacteriorhodopsin proteins in response to
a. a decrease in temperature. b. a depletion of usable organic compounds. c. an increase in light. d. anoxia.
Double fertilization is important to the reproductive process because it produces
A. nutrition for the seed. B. a double portion of endosperm. C. a reaction that keeps the plant from dying. D. both the zygote and the endosperm. E. None of these is true.