1. Milk sugar is

(a) sucrose

(b) lactose

(c) maltose

(d) glucose

2. The carbohydrate used for silvering of mirror is

(a) fructose

(b) starch

(c) glucose

(d) cellulose

3. Raffinose is a

(a) monosaccharide

(b) disaccharide

(c) trisaccharide

(d) polysaccharide

4. Which one of the following is NOT produced by human body.

(a) DNA

(b) hormones

(c) enzymes

(d) vitamins

5. A biological catalyst is essentially

(a) an amino acid

(b) an enzyme

(c) a nitrogen molecule

(d) a carbohydrate

6. Night blindness is due to the deficiency of

(a) \(\operatorname{vitamin} A\)

(b) vitamin \(B\)

(c) vitamin \(\mathrm{C}\)

(d) vitamin D

7. Which of the following contains the element, cobalt?

(a) vitamin c

(b) vitamin \(B_{12}\)

(c) chlorophyll

(d) haemoglobin

8. Which of the following vitamins is water soluble?

(a) \(\mathrm{A}\)

(b) \(B\)

(c) \(\mathrm{E}\)

(d) D

9. Which one of the following is not a constituent of RNA?

(a) Ribose

(b) Uracil

(c) Thymine

(d) Phosphate

10. DNA is a polymer of units of

(a) sugars

(b) ribose

(c) amino acids

(d) nucleotides

11. Which one of the following molecules will form zwitter ion?

(a) \(\mathrm{CH}_3 \mathrm{COOH}\)

(b) \(\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{NH}_2\)

(c) \(\mathrm{CCl}_3 \mathrm{NO}_2\)

(d) \(\mathrm{NH}_2 \mathrm{CH}_2 \mathrm{COOH}\)

12. In metabolic process the maximum energy is given by

(a) carbohydrates

(d) proteins

(c) vitamins

(d) fats

13. Insulin is

(a) harmone

(b) antibiotic

(c) antiseptic

(d) vitamin

14. The secondary structure of a protein is determined by

(a) co-ordinate bond

(b) covalent bond

(c) ionic bond

(d) hydrogen bond

15. In maltose, glycosidic linkage is present between the two glucose units at positions

(a) 1,2

(b) 1,1

(c) 1,3

(d) 1,4

16. Vitamin \(B_2\) is also known as

(a) riboflavin

(b) thiamine

(c) nicotinamide

(d) pyridoxine

17. The sugar present in DNA is

(a) deoxyribose

(b) ribulose

(c) glucose

(d) ribose

18. Sucrose molecule consists of

(a) a glucofuranose and a fructopyranose

(b) a glucofuranose and a fructofuranose

(c) a glucopyranose and a fructopyranose

(d) a glucopyranose and a fructofuranose

19. Which of the following statement is not correct about DNA molecule?

(a) It has double helix structure

(b) It serves as hereditary material

(c) The two DNA strands are exactly similar

(d) Its replication is called semi-conservative mode of replication.

20. The number of \(\mathrm{sp}^2\) and \(\mathrm{sp}^3\) hybridized carbon atoms in fructose are respectively.

(a) 4 and 2

(b) 2 and 4

(c) 1 and 5

(d) 5 and 1

21. A sesquiterpene, abscisic acid contains how many isoprene units?

(a) Two

(b) Three

(c) Four

(d) Five

22. Cholesterol is an example of

(a) zoosterols

(b) phytosterol

(c) mycosterols

(d) glycerols

23. A terpene, caryophyllene is found in

(a) oil of turpentine

(b) oil of roses

(c) oil of ginger

(d) oil of cloves

24. Which of the following substances does not fall in the category of carbohydrates?

(a) Sugars

(b) Starch

(c) Glycol

(d) Cellulose

25. Which of the following does not belong to the category of hexoses?

(a) Glucose

(b) Fructose

(c) Galactose

(d) Ribose

26. Which of the following statements is not correct?

(a) Symbols D- and L-before the name of monosacharides refer to the direction of rotation of the light

(b) Pyranose has a six-membered ring structure

(c) Furanose has a five-membered ring structure

(d) Pyranose and furanose are the examploes of hemiketal

27. Maltose is formed by the union of

(a) one molecule of glucose and one molecule of fructose

(b) one molecule of glucose and one molecule of fructose

(c) two molecule of glucose

(d) two molecule of galactose

28. Which of the following sugars has the largest relative sweetness with respect to sucrose?

(a) Glucose

(b) Fructose

(c) Galactose

(d) Maltose

29. Invert sugar is a mixture of

(a) glucose and sucrose

(b) glucose and fructose

(c) glucose and maltose

(d) lactose and maltose

30. Monomer of cellulose is

(a) lactose

(b) maltose

(c) fructose

(d) glucose

31. Which of the following statements is not correct?

(a) Polysaccharides are also known as glycans

(b) Glycogen, starch and cellulose are the examples of homopolysaccharids

(c) Amylose is a branched polymer of \(\alpha\)-glucose

(d) Starch exists in two polymorphic forms \(\alpha\) amylose and amylopectin

32. Which of the following statements is not correct?

(a) In nature, about 20 amino acids occur in proteins

(b) The human body can synthesize all the 20 amino acids occuring in proteins

(c) The simplest amino acid is glycine

(d) There are ten essential amino acids

33. The number of amino acids in insulin is

(a) 31

(b) 41

(c) 51

(d) 61

34. The number of amino acid units in haemoglobin is

(a) 554

(b) 564

(c) 574

(d) 584

35. Which of the following statements is not correct?

(a) The tertiary structure of proteins is three dimensional

(b) In globular proteins, nearly allthe hydrophobic groups are hidden inside and the polar groups are present on the surface resulting into a spheroidal shape

(c) Only hydrogen bonds are involved in the tertiary structure of proteins

(d) Globular proteins are insoluble in water

36. Which of the following statements is not correct?

(a) A peptide bond is \(-\mathrm{CO}-\mathrm{NH}-\)

(b) Each polypeptide has one C-terminal and the other \(\mathrm{N}\)-terminal

(c) The aminoa cid sequence of a protein determines the function of the protein

(d) The union of two amino acids produces two peptide linkages

37. Nucleic acids are

(a) small molecules

(b) polymeric in nature

(c) the compounds of \(\mathrm{C}, \mathrm{H}\) and \(\mathrm{O}\)

(d) essentially proteins

38. Which of the following bases is not common to DNA and RNA?

(a) Adenine

(b) Guanine

(c) Thymine

(d) Cytosine

39. Which of the following bases is present in RNA only?

(a) Adenine

(b) Guanine

(c) Uracil

(d) Thymine

40. Thymine is held by two hydrogen bonds with the base

(a) guanine

(b) cytosine

(c) thymine

(d) adenine

41. A cell membrane is made up of

(a) lipid

(b) phospholipid

(c) bilayer of phospholipid molecule

(d) only protein

42. Which of the following is not a lipid?

(a) Oils

(b) Waxes

(c) Cholesterol

(d) Glycerol

43. The constitutents of phospholipids are

(a) glycerol and fatty acids

(b) glycerol and phosphate

(c) glycerol, phosphate, two fatty acids and one alcoholic compound

(d) glycerol phosphate, two fatty acids and one alcoholic compound

44. Biochemical reactions which can take place in the absence of oxygen are called

(a) glycolysis

(b) aerobic

(c) metlabolic

(d) anaerobic

45. Molasses contain about 50 per cent of

(a) starch

(b) sucrose

(c) water

(d) ethyl alcohol

46. Which of the following enzymes converts starch into maltose?

(a) Maltase

(b) Diastase

(c) Zymase

(d) Invertase

47. Which of the following enzymes converts maltose into maltose?

(a) Maltase

(b) Diastase

(c) Zymase

(d) Invertase

48. Clotting of blood is possible because of

(a) WBC

(b) RBC

(c) platelets

(d) globulins

49. Which of the following is true about vitamins?

(a) Vitamins in the human body are needed in large amounts

(b) Vitamins are secreted by ductless glands

(c) Vitamins are synthesized by an rganisms

(d) Vitamins A, D, E and \(\mathrm{K}\) are fat soluble whereas vitamins of the \(B\) group and vitamin C are water soluble

50. The disease beriberi is caused by the deeficiency of vitamin

(a) \(\mathrm{A}\)

(b) \(K\)

(c) \(\mathrm{B}_1\)

(d) \(\mathrm{B}_{12}\)