The base pairing between ________ is especially strong because it contains an additional ________ bond, compared to ________
a. A and T / ionic / C and G
b. A and T / hydrogen / C and G
c. C and G / ionic / A and T
d. C and G / hydrogen / A and T
Answer: D
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A) pressure / nutrient levels B) nutrient levels / pressure C) temperature / pressure D) oxygen / pressure
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a. bees. b. butterflies. c. flies. d. beetles. e. all of these.
Which one of the following enables T helper cells to stimulate and activate other cells of the immune response?
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