The moon lacks life and varies dramatically in temperature. If we could keep a layer of water spread on the surface of the moon, what effect would it have?
A) Physical conditions would remain the same.
B) Because water has a high heat of vaporization, the temperatures would rise to the upper extremes.
C) The temperatures would drop to the lower extremes.
D) Water would absorb and hold heat and moderate the temperature extremes.
E) Life would be possible, but it would have to withstand these extremes in temperature.
D) Water would absorb and hold heat and moderate the temperature extremes.
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When nitrate is reduced to dinitrogen gas (N2), nitrogen is removed from the ecosystem and returned to the atmosphere through a series of reactions collectively known as ________.
A. denitrification B. nitrogen fixation C. anammox reaction D. All of the choices are correct.
Leishmaniasis is transmitted through the bite of a(n) ________.
A. Anopheles mosquito B. sand fly C. tsetse fly D. hard-bodied tick E. reduviid "kissing" bug
What cellular process is represented in the accompanying figure?
a. lysis
b. exocytosis
c. cotransport
d. pinocytosis
e. facilitated diffusion
Which of the following is a reasonable explanation for why unsaturated fatty acids help keep a membrane more fluid at lower temperatures?
A) The double bonds form kinks in the fatty acid tails, preventing adjacent lipids from packing tightly. B) Unsaturated fatty acids have a higher cholesterol content and, therefore, more cholesterol in membranes. C) Unsaturated fatty acids are more polar than saturated fatty acids. D) The double bonds block interaction among the hydrophilic head groups of the lipids.