Which of the following is an example of cooperativity?
A) the binding of an end product of a metabolic pathway to the first enzyme that acts in the pathway
B) one enzyme in a metabolic pathway passing its product to act as a substrate for the next enzyme in the pathway
C) a molecule binding at one unit of a tetramer, allowing faster binding at each of the other three
D) binding of an ATP molecule along with one of the substrate molecules in an active site
C
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Members of the genus Micrococcus usually exist as ________.
A. irregular clusters B. pairs C. tetrads D. All of the choices are correct.
Consider a biochemical pathway that branches to form two different products. If the end product of one of the branches is present in a large amount, at what point would the pathway be regulated to ensure adequate production of the end product of the alternative pathway while slowing or stopping production of the product already present in excess?
A. At the last step in the pathway to the product in excess B. At the point where the two pathways branch C. At the last step in the pathway to the alternative product still needed D. At the very first step in the entire pathway
The bulk of a jellyfish consists of
a. mesoderm. b. mesohyl. c. mesophyll. d. mesoglea. e. mesogel.
The crown-of-thorns sea star, Acanthaster planci, preys on the flesh of live coral
If coral animals are attacked by these sea stars, then what actually provides nutrition to the sea star, and which chemical (besides the toxin within their nematocysts) do the corals rely on for protection? A) medusae; silica B) exoskeleton; calcium carbonate C) polyps; calcium carbonate D) polyps; silica