Free Vitamins and Minerals MCQs with Answers
77 Vitamins and Minerals MCQs from Biochemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
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- A. Myoglobin
- B. Pyruvate kinase
- C. Catalase
- D. Cytochrome
Explanation: Myoglobin, cytochromes and catalase contain heme iron for oxygen binding or electron and peroxide reactions.
Correct answer: Pyruvate kinase- A. Alpha ketoglutarate dehydrogenase
- B. Transaldolase
- C. Transketaolase
- D. Pyruvate dehydrogenase
Explanation: Thiamine pyrophosphate is required by transketolase, and its activity in red blood cells decreases in thiamine deficiency.
Correct answer: Transketaolase- A. Keratomalacia
- B. Xerophthalmia
- C. Bitot's spot
- D. Nyctalopia
Explanation: Nyctalopia, or night blindness, is usually the earliest clinical manifestation of vitamin A deficiency because retinal photopigment…
Correct answer: Nyctalopia- A. Acetyl co enzyme A
- B. THF4
- C. Biotin
- D. Pyridoxine
Explanation: Tetrahydrofolate, written here as THF4, carries and transfers one-carbon units in reactions such as nucleotide synthesis.
Correct answer: THF4- A. Myoglobin
- B. Cytochrome
- C. Pyruvate kinaseConsult A Nutritionist
- D. Catalase
Explanation: Iron is present in the heme groups of myoglobin, cytochromes and catalase.
Correct answer: Pyruvate kinaseConsult A Nutritionist- A. Cow's milk
- B. Human milk
- C. Egg yolk
- D. Rice
Explanation: Rice contains very little calcium compared with milk and egg yolk, making it the poorest source listed.
Correct answer: Rice- A. Transferrin
- B. Ferritin
- C. Apoferritin
- D. Lactoferrin
Explanation: Transferrin binds iron in the blood and transports it to tissues. Ferritin and apoferritin are mainly involved in iron storage, while…
Correct answer: Transferrin- A. Ascending colon
- B. Middle segment of small intestine
- C. Proximal segment of small intestine
- D. Ileum
Explanation: Calcium absorption is greatest in the proximal small intestine, especially the duodenum, where vitamin D-dependent transport is active.
Correct answer: Proximal segment of small intestine- A. 1gm
- B. 10 microgram
- C. 10 mg
- D. 20 mg
Explanation: An adult man generally needs about 10 mg of dietary iron daily, although only roughly 1 mg is absorbed to replace normal losses.
Correct answer: 10 mg- A. Zn++
- B. Ca++
- C. Cu++
- D. Selenium
Explanation: Zinc is the second most abundant trace element in the human body after iron.
Correct answer: Zn++- A. Chromium
- B. Zinc
- C. Copper
- D. Potassium
Explanation: Zinc deficiency impairs growth and sexual development and commonly causes loss of taste, called hypogeusia or dysgeusia.
Correct answer: Zinc- A. Phytates
- B. Phosphates
- C. Tannins
- D. Ascorbic acid
Explanation: Ascorbic acid reduces ferric iron to the more absorbable ferrous form and improves intestinal iron absorption.
Correct answer: Ascorbic acid- A. Tryptophan
- B. Theronine
- C. Tyrosine
- D. Histidine
Explanation: Tryptophan is converted to niacin through kynurenine pathway intermediates, although the conversion is relatively inefficient.
Correct answer: Tryptophan- A. Both A and B
- B. Formation of osteoid matrix
- C. Calcification of osteoid
- D. Maturation of procollagen
Explanation: Vitamin C is required for hydroxylation during procollagen maturation and supports formation of the collagen-rich osteoid matrix.
Correct answer: Both A and B- A. Vitamin B complex
- B. Vitamin C
- C. Iron
- D. Calcium
Explanation: Cereals provide several B vitamins and minerals but are generally poor sources of vitamin C.
Correct answer: Vitamin C- A. V a
- B. VIII a
- C. VIII a and V a
- D. None of the above
Explanation: Activated protein C, with protein S as a cofactor, inactivates factors Va and VIIIa.
Correct answer: VIII a and V a- A. James lind
- B. Fracastorius
- C. John snow
- D. Edward Jenner
Explanation: James Lind demonstrated that citrus fruits could prevent and treat scurvy among sailors, establishing the importance of vitamin C.
Correct answer: James lind- A. Perleche
- B. Pellagra
- C. Beri beri
- D. Nyctalopia
Explanation: Niacin deficiency causes pellagra, classically remembered by the three Ds: dermatitis, diarrhoea and dementia.
Correct answer: Pellagra- A. Hemolytic anemia
- B. Posterior column abnormalities
- C. Autonomic dysfunctions
- D. Cerebellar ataxia
Explanation: Vitamin E deficiency causes oxidative hemolysis and neurological problems such as posterior-column involvement and cerebellar ataxia.
Correct answer: Autonomic dysfunctions- A. The synthesis of clotting factors
- B. The microsomal hydroxylation reactions
- C. Antioxidant mechanisms
- D. Post translational modifications
Explanation: Both vitamins participate in post-translational modification: vitamin K gamma-carboxylates clotting proteins, while vitamin C hydroxylates…
Correct answer: Post translational modificationsVitamins and Minerals MCQs: common questions
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