Patients with phenylketonuria present with decreased pigmentation. Which of the following in the metabolism of phenylalanine is most likely the mechanism causing this?
a. Lack of phenylalanine hydroxylase decreasing tyrosine production.
b. Decreased production of serotonin due to phenylketone inhibition.
c. Increased build up of phenylalanine inhibiting tyrosinase activity.
d. Increased production of phenylketones inhibiting production of gamma-aminobutyric acid.
Question 2
Colon cancer risk reduction in humans via intake of cruciferous vegetables is linked to glutathione S-transferase genotype.
a. True
b. False
Indicate whether the statement is true or false
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