Eggs have receptors that recognize surface proteins on sperm of their own species. This illustrates ____

a. behavioral isolation
b. gametic isolation
c. hybrid breakdown
d. hybrid inviability
e. hybrid sterility


ANSWER: b

Biology & Microbiology

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Indicate whether the statement is true or false

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Coupled transport of glucose and Na+ into the intestinal epithelial cell is an example of

a. facilitated diffusion. b. symport. c. antiport. d. endocytosis.

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At what phase in the cell cycle does DNA replication occur?

A) G0 B) S C) G1 D) M

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Which direction are phosphodiester bonds of DNA usually built in?

A) 3' ? 5' B) 5' ? 1' C) 1' ? 5' D) 5' ? 3' E) Any direction is fine and will not affect the function of the DNA strand.

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