All the Following Statements Regarding the Biosynthesis of Porphyrins Are

question 33

Multiple Choice

All the following statements regarding the biosynthesis of porphyrins are true EXCEPT

• A) glycine and succinyl-CoA are the substrates for delta-aminolevulinic acid (delta-ALA) synthase.
• B) delta-ALA is a 5-carbon acid possessing a ketone group at carbon number 4 and an amino group at carbon number 5.
• C) porphobilinogen contains 9 carbon atoms; it is formed from two delta-ALA molecules under the influence of the enzyme delta-ALA dehydratase.
• D) porphobilinogen is a substituted pyrrole ring.
• E) the first cyclic tetrapyrrole formed in the main pathway is uroporphyrinogen III.

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