Multiple choice

The biosynthesis of heme requires all of the following except

  1. propionic acid

  2. succinyl CoA

  3. glycine

  4. ferrous ion

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A Correct answer
Explanation

Heme biosynthesis requires succinyl CoA, glycine, and ferrous ion as key substrates. Propionic acid is not involved in heme synthesis - it's a fatty acid that can be converted to succinyl CoA via propionyl CoA, but is not a direct reactant.