What determines the gender of a human fetus?
a. presence of an SRY gene
b. presence of X and Y chromosomes
c. absence of an X chromosome
d. the sex chromosomes in the egg
e. the presence of estrogen
ANSWER: a
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In a temporal separation of the steps of photosynthesis, the steps are separated by
a. location. b. season. c. time. d. weather conditions
Where the thermocline forms is indicated by
a. A. b. B. c. C. d. D. e. none of these
The largest part of the brain in humans is the ___________
Fill in the blank(s) with the appropriate word(s)
Simple diffusion and facilitated diffusion are related in that both
(A) require protein carriers (B) depend on a concentration gradient (C) occur via contractions of cytoskeletal elements attached to membrane proteins (D) are endergonic processes and thus require the hydrolysis of ATP (E) occur in eukaryotic cells but not in prokaryotic cells