A biological species is defined as a population whose members can interbreed, although the offspring may be infertile.
a. true
b. false
b. false
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Response to a stimulus, such that the effect of the stimulus is counteracted, is called a ________ feedback.
A. complementary B. complex C. negative D. positive
The network of branching filaments that form the main body of a multicellular fungus is the:
A. mycelium. B. hypha. C. fruiting body. D. spore. E. rhizoid.
Bulk flow in the phloem tissue is mostly downward whereas bulk flow in xylem is mostly:
A. sideways B. also downward C. very little bulk flow occurs in xylem D. flow of sugars E. upward
A sick person often has a fever, which can inhibit the growth of bacteria because
A) bacteria reproduce more rapidly at higher body temperature. B) enzymes do not function as well at temperatures other than the optimal temperature. C) the higher temperature increases the activity of lyases. D) sweating removes prosthetic groups from biological enzymes. E) fever blocks synthesis of proteins in the bacterial nucleus.