Four of the five interactions listed below are
relationships in which at least one of the participants
benefits. Select the exception.
a. competition
b. parasitism
c. mutualism
d. commensalism
e. predation
Answer: a
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Which sequence of events is required for the brain to interpret sound?
I. Vibration of the basilar membrane relative to the tectorial membrane causes cilia on hair cells to bend and triggers depolarization. II. Hair cells stimulate the production of action potentials in sensory neurons that project to the brain. III. Ganglion cell axons transmit action potentials to the occipital lobe. A. II then I B. III then I then II C. III then I D. I then II E. I then II then III
Over the past several decades, the overall trend for earth's temperatures has been
A. decreases in overall global temperatures at an accelerating rate, a phenomenon known as global cooling. B. a gentle trend towards colder winters and hotter summers, which averages out to be very little overall global temperature changes. C. cyclical periods of warming and cooling, known as global climate change. D. increases in overall global temperatures at an accelerating rate, a phenomenon known as global warming.
Crassulacean acid metabolism (CAM) is a form of photosynthesis that
A. encourages the light-independent reactions to take place at night. B. allows photosynthesis to take place without water. C. encourages the light-dependent reactions to take place at night. D. allows photosynthesis to take place without carbon dioxide.
Compared to the normal situation, in which actin monomers carry ATP, what do you predict would happen if actin monomers that bind a nonhydrolyzable form of ATP were incorporated into actin filaments?
(a) Actin filaments would grow longer. (b) Actin filaments would grow shorter because depolymerization would be enhanced. (c) Actin filaments would grow shorter because new monomers could not be added to the filaments. (d) No change, as addition of monomers binding nonhydrolyzable ATP would not affect actin filament length.