Most Important Biochemistry MCQ's :
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1. A drug which prevents uric acid synthesis by inhibiting the enzyme xanthine oxidase is
(A) Aspirin
(B) Allopurinol
(C) Colchicine
(D) Probenecid
Answer : (B) Allopurinol
2. Which of the following is required for crystallization and storage of the hormone insulin?
(A) Mn++
(B) Mg++
(C) Ca++
(D) Zn++
Answer : (D) Zn++
3. Oxidation of which substance in the body yields the most calories
(A) Glucose
(B) Glycogen
(C) Protein
(D) Lipids
Answer : (D) Lipids
4. Milk is deficient in which vitamins?
(A) Vitamin C
(B) Vitamin A
(C) Vitamin B2
(D) Vitamin K
Answer : (A) Vitamin
5. Milk is deficient of which mineral?
(A) Phosphorus
(B) Sodium
(C) Iron
(D) Potassium
Answer : (C) Iron
6. Synthesis of prostaglandinsis is inhibited by
(A) Aspirin
(B) Arsenic
(C) Fluoride
(D) Cyanide
Answer : (A) Aspirin
7. HDL is synthesized and secreted from
(A) Pancreas
(B) Liver
(C) Kidney
(D) Muscle
Answer : (B) Liver
8. Which are the cholesterol esters that enter cells through the receptor-mediated endocytosis of lipoproteins hydrolyzed?
(A) Endoplasmin reticulum
(B) Lysosomes
(C) Plasma membrane receptor
(D) Mitochondria
Answer : (B) Lysosomes
9. Which of the following phospholipids is localized to a greater extent in the outer leaflet of the membrane lipid bilayer?
(A) Choline phosphoglycerides
(B) Ethanolamine phosphoglycerides
(C) Inositol phosphoglycerides
(D) Serine phosphoglycerides
Answer : (A) Choline phosphoglycerides
10. All the following processes occur rapidly in the membrane lipid bilayer except
(A) Flexing of fatty acyl chains
(B) Lateral diffusion of phospholipids
(C) Transbilayer diffusion of phopholipids
(D) Rotation of phospholipids around their long axes
Answer : (C) Transbilayer diffusion of phopholipids
11. The general formula of monosaccharides is
(A) CnH2nOn
(B) C2nH2On
(C) CnH2O2n
(D) CnH2nO2n
Answer : (A) CnH2nOn
12. The general formula of polysaccharides is
(A) (C6H10O5)n
(B) (C6H12O5)n
(C) (C6H10O6)n
(D) (C6H10O6)n
Answer : (A) (C6H10O5)n
13. The aldose sugar is
(A) Glycerose
(B) Ribulose
(C) Erythrulose
(D) Dihydoxyacetone
Answer : (A) Glycerose
14. A triose sugar is
(A) Glycerose
(B) Ribose
(C) Erythrose
(D) Fructose
Answer : (A) Glycerose
15. A pentose sugar is
(A) Dihydroxyacetone
(B) Ribulose
(C) Erythrose
(D) Glucose
Answer : (B) Ribulose
16. The pentose sugar present mainly in the heart muscle is
(A) Lyxose
(B) Ribose
(C) Arabinose
(D) Xylose
Answer : (A) Lyxose
17. Polysaccharides are
(A) Polymers
(B) Acids
(C) Proteins
(D) Oils
Answer : (A) Polymers
18. The number of isomers of glucose is
(A) 2
(B) 4
(C) 8
(D) 16
Answer : (D) 16
19. Two sugars which differ from one another only in configuration around a single carbon atom are termed
(A) Epimers
(B) Anomers
(C) Optical isomers
(D) Stereoisomers
Answer : (A) Epimers
20. Isomers differing as a result of variations in configuration of the —OH and —H on carbon atoms 2, 3 and 4 of glucose are known as
(A) Epimers
(B) Anomers
(C) Optical isomers
(D) Steroisomers
Answer : (A) Epimers
21. All proteins contain the
(A) Same 20 amino acids
(B) Different amino acids
(C) 300 Amino acids occurring in nature
(D) Only a few amino acids
Answer : (A) Same 20 amino acids
22. Proteins contain
(A) Only L- α - amino acids
(B) Only D-amino acids
(C) DL-Amino acids
(D) Both (A) and (B)
Answer : (A) Only L- α - amino acids
23. The optically inactive amino acid is
(A) Glycine
(B) Serine
(C) Threonine
(D) Valine
Answer : (A) Glycine
24. At neutral pH, a mixture of amino acids in solution would be predominantly:
(A) Dipolar ions
(B) Nonpolar molecules
(C) Positive and monovalent
(D) Hydrophobic
Answer : (A) Dipolar ions
25. The true statement about solutions of amino acids at physiological pH is
(A) All amino acids contain both positive and negative charges
(B) All amino acids contain positively charged side chains
(C) Some amino acids contain only positive charge
(D) All amino acids contain negatively charged side chains
Answer : (A) All amino acids contain both positive and negative charges
26. pH (isoelectric pH) of alanine is
(A) 6.02
(B) 6.6
(C) 6.8
(D) 7.2
Answer : (A) 6.02
27. Since the pK values for aspartic acid are 2.0, 3.9 and 10.0, it follows that the isoelectric (pH) is
(A) 3.0
(B) 3.9
(C) 5.9
(D) 6.0
Answer : (A) 3.0
28. Sulphur containing amino acid is
(A) Methionine
(B) Leucine
(C) Valine
(D) Asparagine
Answer : (A) Methionine
29. An example of sulphur containing amino acid is
(A) 2-Amino-3-mercaptopropanoic acid
(B) 2-Amino-3-methylbutanoic acid
(C) 2-Amino-3-hydroxypropanoic acid
(D) Amino acetic acid
Answer : (A) 2-Amino-3-mercaptopropanoic acid
30. All the following are sulphur containing amino acids found in proteins except
(A) Cysteine
(B) Cystine
(C) Methionine
(D) Threonine
Answer : (D) Threonine
31. An example of a hydroxy fatty acid is
(A) Ricinoleic acid
(B) Crotonic acid
(C) Butyric acid
(D) Oleic acid
Answer : (A) Ricinoleic acid
32. An example of a saturated fatty acid is
(A) Palmitic acid
(B) Oleic acid
(C) Linoleic acid
(D) Erucic acid
Answer : (A) Palmitic acid
33. If the fatty acid is esterified with an alcohol of high molecular weight instead of glycerol, the resulting compound is
(A) Lipositol
(B) Plasmalogen
(C) Wax
(D) Cephalin
Answer : (C) Wax
34. A fatty acid which is not synthesized in the body and has to be supplied in the diet is
(A) Palmitic acid
(B) Lauric acid
(C) Linolenic acid
(D) Palmitoleic acid
Answer : (C) Linolenic acid
35. Essential fatty acid:
(A) Linoleic acid
(B) Linolenic acid
(C) Arachidonic acid
(D) All these
Answer : (D) All these
36. The fatty acid present in cerebrosides is
(A) Lignoceric acid
(B) Valeric acid
(C) Caprylic acid
(D) Behenic acid
Answer : (A) Lignoceric acid
37. The number of double bonds in arachidonic acid is
(A) 1
(B) 2
(C) 4
(D) 6
Answer : (C) 4
38. In humans, a dietary essential fatty acid is
(A) Palmitic acid
(B) Stearic acid
(C) Oleic acid
(D) Linoleic acid
Answer : (D) Linoleic acid
39. A lipid containing alcoholic amine residue is
(A) Phosphatidic acid
(B) Ganglioside
(C) Glucocerebroside
(D) Sphingomyelin
Answer : (D) Sphingomyelin
40. Cephalin consists of
(A) Glycerol, fatty acids, phosphoric acid and choline
(B) Glycerol, fatty acids, phosphoric acid and ethanolamine
(C) Glycerol, fatty acids, phosphoric acid and inositol
(D) Glycerol, fatty acids, phosphoric acid and serine
Answer : (B) Glycerol, fatty acids, phosphoric acid and ethanolamine
