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Allosteric enzymes are

  • A.larger than simple enzyme
  • B.smaller than simple enzyme
  • C.larger and more complex than simple enzyme
  • D.smaller than simple enzyme but not complex

Answer: C

Correct answer: larger and more complex than simple enzyme

An allosteric enzyme is larger and more complex than a simple one, because it needs more than an active site: it is built of several polypeptide subunits and carries one or more regulatory sites as well. That extra structure is what allows a modulator to bind at one place and change the shape of the catalytic site elsewhere.

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