Coproporphyrinogen I:

    1. Intermediate in heme synthesis
    2. Intermediate in heme degradation
  1. A only
  2. B only
  3. Both A and B
  4. Neither A or B

Right

Coproporphyrinogen I is an apparently useless side product of heme synthesis.
It is not an intermediate on the pathway to heme.
The coproporphyrinogens have nothing to do with heme degradation.

Go to the next question