THE UNIVERSITY OF BAMENDA

COLLEGE OF TECHNOLOGY

FIRST SEMESTER EXAMINATION COURSE: BIOCHEM 1

This examination paper is made up of 93 multiple-choice questions, each containing five answers,

only one of which is correct. Use the answer sheet provided and for each question, put an x in the

square corresponding to the right answer. Avoid guess work.

1. A lipid containing alcoholic amine residue is: a) Phosphatidic acid b) Gangliosides

c) Glucocerebrosides d) Sphingomyeline e) Lignin

d) Oleic acid e) Palmitic acid

6. 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 e) None of these

7. Cephalin consists of: a) Glycerol, fatty acids, phosphoric acid and choline b) Glycerol, fatty

acid, phosphoric acid and ethanolamine c) Glycerol, fatty acid, phosphoric acid and inositol

d) Glycerol, fatty acid, phosphoric acid and serine e) None of the above

8. In humans, dietary essential fatty acids is: a) Palmitic acid b) Stearic acid c) Oleic acid

d) Linoleic acid e) None of these

9. An example of a hydroxyl fatty acid is: a) Ricinoleic acid b) Crotonic acid c) Butyric acid

d) Oleic acid e) None of these

12. Nutritional polysaccharides are: a) Starch and glycogen b) Starch and chitin c) Starch and

cellulose d) Starch and glucose e) Starch and fructose

13. Carbohydrates are: a) Polyhydroxy, aldehydes and phenols b) Polyhydroxy, aldehydes and

alcohols c) Polyhydroxy, ketones and phenols d) Polyhydroxy, phenols and alcohols e) None of these

14. The smallest carbohydrates are trioses. Which of the below is a triose? a) Glucose

b) Ribulose c) Ribose d) Glyceraldehyde e) Starch

15. Which of the following is a reducing sugar? a) Glucose b) Dihydroxyacetone c) Erythulose

d) Starch e) None of these

16. Oligosaccharides linked to proteins are called: a) Glycoproteins b) Glycolipids

c) Galactosides d) Gangliosides e) Galactose

20. Maltose is a disaccharide made up of: a) Glucose and fructose b) Glucose and galactose

c) Glucose and sucrose d) Glucose and glucose e) Glucose and glycogen

21. Maltose has the linkage of: a) β-1-4 linkage b) β-1-2 linkage c) α-1-4 linkage d) α-1-2 linkage

e) ω-1-4 linkage

22. Amylopectin has the linkage of: a) β-1-4 linkage b) β-1-2 linkage c) α-1-4 linkage d) α-1-2

linkage e) ω-1-4 linkage

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MINISTRY OF HIGHER EDUCATION

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24. The general formula for monosaccharide is: a) C

2n

H

2

O

n

c) C

H

2n

d) C

H

2n

O

n

e) None of these

25. A pentose sugar is: a) Dihydroxyacetone b) Erythrose c) Glucose d) Galactose e) Ribose

26. The pentose sugar present mainly in the heart is: a) Xylose b) Ribose c) Arabinose

d) Glucose e) Galactose

27. Two sugars that differ from each other in configuration around a single carbon atom are

called: a) Epimers b) Anomers c) Optical isomers d) Stereoisomers e) None of these

28. The general formula for polysaccharides is: a) (C

n

O

n

b) (C

)

6

H

10

O

6

)

n

d) (C

5

H

10

O

6

2n

e) (C

6

H

10

32. The sugar found in DNA is: a) Xylose b) Ribose c) Deoxyribose c) Erythrose e) Glucose

33. An example of an invert sugar is: a) Galactose b) Sucrose c) Fructose d) Lactose e) Glucose

34. Which of the following is a non-reducing sugar? a) Isomaltose b) Maltose c) Lactose

d) Cellobiose e) None of these

35. Which of the following is a reducing sugar? a) Isomaltose b) Sucrose c) Trehalose d) Agar

e) Glucose

36. Mutarotation refers to a change in: a) pH b) Optimal rotation c) Conductance d) Chemical

properties e) Temperature

37. A dissacharide formed by 1,1-glycosidic linkage between the monosaccharide units is:

a) Lactose b) Maltose c) Trehalose d) Sucrose e) Glucose

40. pH (isoelectric pH) of alanine is: a) 6.02 b) 6.6 c) 6.8 d) 7.2 e) 5.0

41. Sulfur-containing amino acid is: a) Cysteine b) Methionine c) Leucine d) Valine e)

Asparagine

42. All the following are Sulfur-containing amino acid found in proteins except: a) Cysteine b)

Methionine c) Cysteine d) Methionine e) None of these

43. Amino acid with the side chain containing basic group is: a) 2-Amino, 5-guanidovaleric acid

b) 2-Pyrrolidine carboxylic acid c) 2-Amino, 3-mercaptopropanoic acid d) 2-Aminopropanoic acid

e) None of these

44. At neutral pH, a mixture of amino in solution would be predominately: a) Dipolar ions

b) nonpolar molecules c) Positive and monovalent d) Hydrophobic e) Tryptophan-Valine

48. A ketogenic amino acid is: a) Isoleucine b) Valine c) Cysteine d) Leucine e) Threonine

49. Which of the following is a dipeptide? a) Anserine b) Glutathione c) Glucagone d) ®-

Lipoprotein e) None of these

50. An example of a hydroxyl fatty acid is: a) Oleic acid b) Linolenic acid c) Ricinoleic acid

d) Crotonic acid e) Butyric acid

52. The fatty acid present in cerebrosides is: a) Lignoceric acid b) Valeric acid c) Caprylic acid

d) Behenic acid e) None of these

53. The number of double bonds in arachidonic acid is: a) 1 b) 2 c) 4 d) 5 e) 6

54. A lipid containing an alcoholic amine residue is: a) Phosphatidic acid b) Ganglioside

c) Glucocerebroside d) Sphingomyelin e) Palmitic acid

55. Cephalin consists of: a) Glycerol, fatty acids, phosphoric acid and choline b) Glycerol, fatty

acids, phosphoric acid and serine c) Glycerol, fatty acids, phosphoric acid and inositol d) Glycerol,

fatty acids, phosphoric acid and ethanolamine e) All of these

56. In mammals, the major fat in adipose tissue is: a) Phospholipid b) Cholesterol

these e) None of these

59. Monosaccharides such as ribose, fructose, glucose and mannose differ significantly in:

a) Their sweetness b) The positions of their carbonyl groups c) Their diastereoisomeric configurations

d) The number of carbon atoms e) All but the first choice are significant differences

60. Boat and chair conformations are found in: a) Pyranose sugars b) Furanose sugars c) In any

sugar without axial –OH groups d) In any sugar without equatorial –OH groups e) Only in a D-

glucopyranose

61. Which of the following is an example of a polysaccharide made by animals? a) Cellulose

b) Glycogen c) Collagen d) Starch e) Amylopectin

62. Cellulose fibres resemble ……………..in proteins, whereas a-amylose is similar

d) They are strongly hydrophilic e) None of these

65. Which of the following contains an ether-linked alkyl group? a) Cerebrosides b) Gangliosides

c) Sphingomyelin d) Phosphatidylserine e) Platelet-activating factor

66. Which of these statements is true about lipids? a) Many contain fatty acids in ester or amide

linkages b) Many are simply polymers of isoprene c) Testosterone is an important sphingolipid found

in myelin d) They are more soluble in water than they are in chloroform e) They play only passive

roles as energy-storage molecules

67. Which of the following statements is true about membrane lipids? a) Glycerophospholipids

are found only in membranes of plant cells b) Glycerophospholipids contain fatty acids linked to

glycerol through amide bonds c) Lecithin (phosphatidylcholine), which is used as an emulsifier in

69. Fatty acids are a component of: a) Cerebrosides b) Carotene c) Vitamin D d) Vitamin K

e) Sterols

70. Which of the following statements is true about sterols a) All sterols share a fused-ring

structure with 4 rings b) Sterols are found in the membranes of all living cells c) Sterols are water-

soluble, but less so in inorganic solvents such as chloroform d) Stigmasterol is the principal sterol in

fungi e) The principal sterol of animal cells is ergosterol

72. Which of the following best describes the cholesterol molecule? a) Amphipathic b) Nonpolar,

charged c) Nonpolar, uncharged d) Polar, charged e) Polar, uncharged

73. An example of a glycerophospholipid that is involved in cell signaling is: a) Arachidonic acid

b) Ceramide c) Phosphatidylinositol d) Testosterone e) Retinol

74. Which of the following is not a fat-soluble vitamin? a) D b) A c) C d) K e) E

75. Which of the following vitamins is derived from cholesterol? a) D b) A c) B

d) K e) E

76. The primary sequence of protein represents: a) Linear sequence of amino acids joined by

peptide bond b) 3-Dimensional structure of protein c) Helical structure of protein d) Subunit structure

of protein e) None of these

c) β-pleated sheet parallel d) β-pleated sheet non-parallel e) none of these

80. α-helix has: a) 3.4 amino acids residues/turns b) 3.6 amino acids residues/turns c) 3.8 amino

acids residues/turns d) 3.0 amino acids residues/turns e) none of these

81. Which of the following amino acids are rarely present in the α-helix? a) Glycine and proline

b) Proline and tryptophan c) Tryptophan only d) Proline only e) None of these

82. The pH at which ions do not migrate in an electrical field is: a) Isoelectric point b) Isoionic

point c) Both points d) All of these e) None of these

83. The Dansyl method permits to determine the: a) –COOH end group b) –NH2 end group

c) Both end groups d) Peptide bonds e) None of these

84. Which of the following amino acids are (is) most compatible with the helical structure?

c) Acid d) Both a and b e) None of these

88. Which of the following amino acids cannot form hydrogen bonds with their side chain (R)

groups? a) Glycine b) Tyrosine c) Leucine d) Cysteine e) Serine

89. Glucose and galactose are: a) Epimers b) Isomers c) Anomers d) Ketose-aldose isomers

e) None of these

90. Compounds having the same structural formulae but different configurations around the same

carbon atom are called: a) None of these b) Optical isomers c) Epimers d) Stereoisomers e) Anomers

91. A disaccharide produced by the hydrolysis of starch is called: a) Fructose b) Trehalose

c) Maltose d) Lactose e) Sucrose

92. Cellulose is made of repeating units of: a) β-1-4 linkages between D-glucose b) β-1-2