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.

---

Definitions:

Agriculture

The practice of cultivating soil, growing crops, and raising livestock for food, fiber, and other products.

Great Migrations

Refers to the large-scale movements of peoples or animals from one region to another, often highlighted in history for human populations moving for reasons such as war, famine, or climate change.

Paleolithic

The “old” Stone Age, during which humankind produced the first sculptures and paintings.

Neolithic

The “new” Stone Age.