MSCI 530 Amino acids and Vitamins Metabolism Quiz- Liberty University

Question 1
pts
Thymidylate synthase utilizes this form of folate to convert deoxyuridine monophosphate to
deoxythymidine monophosphate for DNA synthesis;

Dihydrofolate

Tetrahydrofolate

Methyl THF

Methylene THF

Question 2
pts
To avoid the proteolytic degradation of Vitamin B12 in the acidic pH of the stomach, it is
commonly attached to;

Intrinsic factor

Haptocorrins

Transcobalamin I

Transcobalamin II

Question 3
pts
Vitamin B12 deficiency has a slow and insidious onset unlike folate deficiency for the following
reasons except;

The pathways that require Vitamin B12 are not quite

essential The liver stores a lot of Vitamin B12

The enterohepatic circulation conserves Vitamin

B12 Intrinsic factor is secreted in large amounts

Question 4
pts

, Pregnancy is associated with a decreased serum homocysteine levels;

True

False

Question 5
pts
Which of these is least likely to result in hyperhomocysteinemia?

Vitamin C deficiency

Pyridoxine deficiency

Folate deficiency

Vitamin B12

deficiency Question 6
pts
Which of these amino acids is considered conditionally essential because its levels are dependent
on dietary intake of methionine?

Alanine

Glutamate

Tyrosine

Cysteine

Question 7
pts
Which of these amino acids is considered as strictly ketogenic and cannot be used in
gluconeogenesis?

Lysine

Histidine