The organic nonprotein components that aid in enzyme functioning are called
A. substrates.
B. products.
C. reactants.
D. cofactors.
E. coenzymes.
Answer: E
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Food chains are sometimes short because _____
A) only a single species of herbivore feeds on each plant species B) local extinction of a species causes extinction of the other species in its food chain C) most of the energy in a trophic level is lost as it passes to the next higher level D) predator species tend to be less diverse and less abundant than prey species E) most producers are inedible
Which of the following contributes to the electrochemical gradient that exists across the thylakoid membrane during photosynthesis?
A. The electron transport chain. B. The splitting of water to produce H+ and oxygen in the thylakoid lumen. C. The depletion of H+ in the stroma during NADPH production. D. The pumping of H+ into the thylakoid lumen by electron transport proteins. E. All of the choices are correct.
The interaction in which one species benefits
and the second species is neither harmed nor benefited is
a. mutualism. b. parasitism. c. commensalism. d. competition. e. predation.
Golgi complexes of prokaryotic cells produce extracellullar polysaccharides that are used to make cell walls
__________________ Indicate whether the statement is true or false.