Each of the Following Statements About Heme Biosynthesis Is Correct

question 99

Multiple Choice

Each of the following statements about heme biosynthesis is correct EXCEPT

• A) pyridoxal phosphate (PLP) is a required coenzyme for one reaction.
• B) major control of the process involves the reaction between glycine and succinyl-CoA.
• C) the porphyrinogen intermediates lack the completely conjugated double-bond system of the porphyrins and accordingly are colorless.
• D) the Series III porphyrinogens of the pathway differ from the Series I compounds in the chemical nature of the side-chains attached to the pyrrole units.
• E) ALA synthase activity is inhibited by high concentrations of heme.

---

Definitions:

Taxable

Refers to income or transactions that are subject to tax by governmental entities according to certain rules and regulations.

Prize or Award

Monetary or material value received as a result of winning a contest or receiving an accolade, which may be taxable income.

W-2 Income

Earnings reported through a Form W-2, showing the total income and taxes withheld from an employee's paycheck by their employer.

Impute Interest

The process of assigning an implied interest rate to an interest-free or below-market interest loan, which then becomes taxable under the Internal Revenue Code.