In prokaryotes, repressor proteins: (Select all correct choices)
A. bind with DNA and prevent transcription.
B. bind with activators and prevent
transcription.
C. are part of the mechanism of positive
regulation.
D. are part of the mechanism of negative
regulation.
A,D
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How do pathogens enter into plant tissues?
A. through wounds or damaged tissues B. through the stomata C. by secreting enzymes that weaken epidermal cells D. on the piercing mouthparts of insects feeding on the plants E. All the answer options are possible means to enter plant tissues.
Asexual reproduction can involve ____
a. fertilization only b. fission only c. fission, budding, or fertilization d. fragmentation, fission, or fertilization e. fragmentation, fission, or budding
At altitudes above 8,000 feet, the body compensates for the hypoxic condition by ____
a. hyperventilation b. decreased hemoglobin production c. decreased EPO release d. constriction of airways e. faster, shallow breathing
The ratio of energy consumed at the next trophic level over what is produced is known as
A) consumption efficiency. B) trophic efficiency. C) food chain efficiency. D) detrital efficiency.