Pair-rule genes
A. are activated by pair-rule genes and by maternal effect genes
B. are activated by gap genes and expressed in alternating stripes
C. are activated by gap genes
D. are activated by segment polarity genes
E. are expressed in alternating stripes
Answer: B
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Highly acidic gastric secretions are kept from leaking out of the stomach by
a. desmosomes. b. tight junctions. c. adhering junctions. d. gap junctions. e. intercalated discs.
What is the main mechanism that results in evolution?
What will be an ideal response?
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A. K-selection; small body and short generation time B. r-selection; large body and long generation time C. K-selection; large body and long generation time D. r-selection; small body and long generation time E. r-selection; large body and short generation time