Women with PKU must avoid the essential amino acid phenylalanine and consume a diet low in protein because _____.
a. they lack enough stomach acid (HCl) to break down dietary proteins, including phenylalanine
b. they are allergic to phenylalanine and other protein-rich foods
c. they lack the enzyme necessary to convert phenylalanine to tyrosine
d. phenylalanine and protein-rich foods cause an accumulation of acid to build up in the blood
e. they are unable to incorporate phenylalanine into proteins, so it builds up in the blood, potentially blocking blood vessels
Question 2
The task of acquiring enough vitamin B12 may pose a problem to vegans because:
a. fibers in vegetables inhibit its absorption.
b. they lack the intrinsic factor.
c. it is found naturally only in animal-derived products.
d. deficiency may occur from excess intake of soy products.
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