Which of the following is a precursor of protoporphyrin_______________?
Correct answer: B. Glycine
- A. Alanine
- B. Glycine
- C. Histidine
- D. Leucine
Explanation
Heme synthesis begins when glycine combines with succinyl-CoA to form aminolevulinate, which ultimately leads to protoporphyrin IX. The other listed amino acids are not the glycine precursor used in this pathway.
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