The cell membranes of wall-less archaeons are strengthened by ________.

A. pseudomurein
B. diglycerol tetraethers
C. glycoprotein or protein layers
D. diglycerol ethers


Answer: B

Biology & Microbiology

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Two specific coenzymes we need to obtain from our diet are niacin and ________, as our bodies cannot synthesize them.

Fill in the blank(s) with the appropriate word(s).

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The middle layer of the skin

a. is called the dermis. b. is primarily connective tissue. c. contains collagen fibers. d. is all of the above.

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Four of the five processes listed below are involved

in the same biogeochemical cycle. Select the exception. a. evaporation b. precipitation c. weathering d. surface flow e. groundwater flow

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Which of the following is/are associated with "predatory aggression"?

a. stimulation of the ventral tegmental area b. high levels of sympathetic activity c. increased vocalizations or threatening postures d. stimulation of the medial hypothalamus e. a and b

Biology & Microbiology