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Vitamins and Coenzymes in Redox Reactions

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Vitamins and Coenzymes in Redox Reactions

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Questions and Answers

What is the main function of folate in the body?

Carries 1C units for transfers in purine and pyrimidine synthesis (correct)

Involved in the synthesis of glycoproteins

Carries methyl groups in mammalian metabolism

conversions of homocysteine to methionine only

Which of the following is NOT a common cause of folate deficiency?

Malabsorption

Long-term antibiotic therapy

Oral contraceptives

Vegan diet (correct)

What is the name of the disease characterized by the lack of intrinsic factor, leading to vitamin B12 deficiency?

Megaloblastic anemia

Pernicious anemia (correct)

Tropical sprue

Crohn's disease

What is the name of the enzyme that is dependent on vitamin B12 and is involved in the conversion of homocysteine to methionine?

Methionine synthase (D) Signup and view all the answers

What is the name of the condition characterized by large, immature erythrocytes due to insufficient thymidylate for purine and pyrimidine synthesis?

Megaloblastic anemia (A) Signup and view all the answers

What is the primary reason why individuals who consume high protein diets do not require niacin supplements?

Because the body can synthesize niacin from tryptophan (A) Signup and view all the answers

What is the primary function of pyridoxal phosphate in the body?

To catalyze transamination reactions involving amino acids (A) Signup and view all the answers

What is the primary source of biotin in the normal human diet?

Intestinal bacterial synthesis (B) Signup and view all the answers

What is the primary consequence of isoniazid treatment on pyridoxine metabolism?

Combination with pyridoxal phosphate, rendering it unavailable (C) Signup and view all the answers

What is a potential consequence of taking high doses of pyridoxine supplements?

Peripheral neuropathy (B) Signup and view all the answers