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NBME CBSE BIOCHEMISTRY VITAMINS TEST
EXAM VERIFIED QUESTIONS & 100%
ACCURATE ANSWERS | COMPLETELY
UPDATED 2025–2026 EDITION A+
PERFORMANCE GUARANTEED
What is vitamine B1 and what enzymes is it a cofactor for?
Thiamine (3 DH's and transketolase (HMP shunt)
How can a deficiency of vitamin B1 cause Maple Syrup Urine Disease?
cause α-ketoacid dehydrogenase deficiency
Alcoholics can predispose with a abnormal transketolase that may have abnormal
binding to thiamine (Vit. B1) what can this result in?
Wernicke-Korsakoff Syndrome (treated with glucose and thiamine together)
What can a vitamin deficiency result in underdeveloped areas?
Dry/Wet Beriberi
An individual presents to the hospital with a vitamin deficiency. They have
dermatitis, glossitis, and cheilitis. There is also corneal vascularization. What is the
presumed prognosis?
Riboflavin deficiency
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What is Vitamin B2 and what is it required for?
Riboflavin (FAD), req for DH's
What is vitamin B3 and what is it required for?
Niacin (NAD), req for DH's
What does the conversion of tryptophan to vitamin B3 (niacin) require
Vitamin B6
A patient presents to the hospital with pellagra. Their symptoms are dermatitis,
diarrhea, and dementia. They also appear to have a bad sunburn. Recently they
were given INH therapy to help with their tuberculosis. What is the probable
prognosis?
Niacin Deficiency (Hartnup or Carcinoid syndrome, INH inhibits B6 which dec
B3)
A patient is diagnosis with a GI tumor that is secreting serotonin. They are
experiencing diarrhea, flushing, and CVD. They are also found to have a
tryptophan deficiency. What is the presumed prognosis?
carcinoid syndrome (low niacin B3)
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A patient presents to the hospital with "burning feet." Upon further investigation
there is necrosis of the adrenal glands. What is the deficiency?
Pantothenic Acid (CoA) deficiency
What is Vitamine B6?
Pyridoxal phosphate
A patient is unable to incorporate iron into Heme. As a result, iron accumulates in
the RBC cytoplasm. What is the deficiency and diagnosis?
Vitamin B6 (pyridoxal phosphate) deficiency causing sideroblastic anemia
A patient presents woth glossitis and oral ulcers. When they are in the hospital they
experience a siezure and afterwards are confused. It is discovered that the patient is
taking INH for their tuberculosis. What is the deficiency?
Vitamin B6 deficiency
What is vitamin B7 and what is it a cofactor for?
biotin (3 carboxylases)
NBME CBSE BIOCHEMISTRY VITAMINS TEST
EXAM VERIFIED QUESTIONS & 100%
ACCURATE ANSWERS | COMPLETELY
UPDATED 2025–2026 EDITION A+
PERFORMANCE GUARANTEED
What is vitamine B1 and what enzymes is it a cofactor for?
Thiamine (3 DH's and transketolase (HMP shunt)
How can a deficiency of vitamin B1 cause Maple Syrup Urine Disease?
cause α-ketoacid dehydrogenase deficiency
Alcoholics can predispose with a abnormal transketolase that may have abnormal
binding to thiamine (Vit. B1) what can this result in?
Wernicke-Korsakoff Syndrome (treated with glucose and thiamine together)
What can a vitamin deficiency result in underdeveloped areas?
Dry/Wet Beriberi
An individual presents to the hospital with a vitamin deficiency. They have
dermatitis, glossitis, and cheilitis. There is also corneal vascularization. What is the
presumed prognosis?
Riboflavin deficiency
,2|Page
What is Vitamin B2 and what is it required for?
Riboflavin (FAD), req for DH's
What is vitamin B3 and what is it required for?
Niacin (NAD), req for DH's
What does the conversion of tryptophan to vitamin B3 (niacin) require
Vitamin B6
A patient presents to the hospital with pellagra. Their symptoms are dermatitis,
diarrhea, and dementia. They also appear to have a bad sunburn. Recently they
were given INH therapy to help with their tuberculosis. What is the probable
prognosis?
Niacin Deficiency (Hartnup or Carcinoid syndrome, INH inhibits B6 which dec
B3)
A patient is diagnosis with a GI tumor that is secreting serotonin. They are
experiencing diarrhea, flushing, and CVD. They are also found to have a
tryptophan deficiency. What is the presumed prognosis?
carcinoid syndrome (low niacin B3)
, 3|Page
A patient presents to the hospital with "burning feet." Upon further investigation
there is necrosis of the adrenal glands. What is the deficiency?
Pantothenic Acid (CoA) deficiency
What is Vitamine B6?
Pyridoxal phosphate
A patient is unable to incorporate iron into Heme. As a result, iron accumulates in
the RBC cytoplasm. What is the deficiency and diagnosis?
Vitamin B6 (pyridoxal phosphate) deficiency causing sideroblastic anemia
A patient presents woth glossitis and oral ulcers. When they are in the hospital they
experience a siezure and afterwards are confused. It is discovered that the patient is
taking INH for their tuberculosis. What is the deficiency?
Vitamin B6 deficiency
What is vitamin B7 and what is it a cofactor for?
biotin (3 carboxylases)
