"The <span>amino acid acts as a corepressor" is the statement among the choices given in the question that is true. The correct option among all the options that are given in the question is the second option or option "B". I hope that this is the answer that has actually come to your great help.
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Provided that there's no diagram, most molecules have particular areas on the molecules, called the "active area" that act as a lock to a particular substrate's molecular structure, providing the key.
An enzyme's active area is only able to be "unlocked" by a certain substrate's "key".
