The protein part of a conjugated enzyme, which on its own is catalytically inactive, is called the

  • A. prosthetic group
  • B. apoenzyme
  • C. holoenzyme
  • D. co-substrate

Explanation

The apoenzyme needs its non-protein partner, the cofactor, to become the active holoenzyme. Calling the whole active complex the apoenzyme is a common slip, so remember that holoenzyme equals apoenzyme plus cofactor.

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