31.

Heme biosynthesis in liver is regulated by all the following EXCEPT

• a. inhibition of delta-aminolevulinic acid synthase transport into mitochondria by heme.
• b. feed back inhibition of delta-aminolevulinic acid synthase activity by delta-aminolevulinic acid.
• c. feed back inhibition of delta-aminolevulinic acid synthase activity by heme.
• d. repression of delta-aminolevulinic acid synthase synthesis by heme.