1. What is the percentage of organic compounds in the dry matter of protoplasm?

(A) 20

(B) 30

(C) 60

(D) 90

2. Which of the following amounts of bases are more likely to be found in an organism?

(A) Adenine 30.9% and Cytosine 30.7%

(B) Guanine 27.5% and Adenine 27.8%

(C) Cytosine 19.8% and Thymine 20.0%

(D) Adenine 32% and Thymine 31.9%

3. 70% of the total weight of the bacterial cell is the

(A) Carbohydrate

(C) Water

(B) Lipid

(D) Protein

4. What is the most abundant compound in a living cell?

(A) Protein

(B) Lipids

(C) Water

(D) Carbohydrate

5. The most abundant organic compound in the cells is the

(A) Carbohydrate

(B) Lipid

(C) Protein

(D) Enzyme

6. What is the proportion of carbohydrate in mammalian cell per total cell weight?

(A) 2

(B) 3

(C) 4

(D) 5

7. Basically carbohydrates are made up of

(A) C, H and S

(B) C, H, N

(C) C, H, 0

(D) N, H, 0

8. Animals obtain carbohydrates mainly from

(A) Glucose

(B) Starch

(C) Sucrose

(D) Glycogen

9. What are the reactants for the formation of lactose?

(A) Glucose + Maltos'e

(B) Glucose + Fructose

(C) Fructose + Maltose

(D) Glucose + Galactose

10. PGAL, is a phosphorylated form of a monosaccharide sugar, it belongs to which group?

(A) Trioses

(B) Hexose

(C) Tetroses

(D) Pentosses

11. The physical property of monosaccharides is that they are

(A) Less sweet and less soluble in water

(B) Sweet and less soluble in water

(C) Sweet and easily soluble in water

(D) Less sweet and insoluble in water

12. What does sucrose yield on hydrolysis?

(A) 2 monosaccharides

(B) 3 monosaccharides

(C) 4 monosaccharides

(D) 5 monosaccharides

13. Which of the following is not a monosaccharide?

(A) Glyceraldehyde

(B) Ribose

(C) Sucrose

(D) Fructose

14. Oligo-saccharides yields monosaccharides on hydro-lysis from

(A) One to three

(B) One to two

(C) Two to ten

(D) Two to five

15. The most important polysaccharides which are stored in plant and animal cells are

(A) Lactose and maltose

(B) Sucrose and maltose

(C) Glucose and ribose

(D) Starch and glycogen

 16. Which of the following is the polysaccharide stored in Rhizopus cell?

 (A) Lactose

(B) Uracil

(C) Choline

(D) Glycogen

17. Which one of the following is not a disaccharide?

(A) Lactose

(B) Glucose

(C) M'altose

(D) Sucrose

18. All of the following are polysaccharides except

(A) Rubber

(B) Cotton

(C) Wood

(D) Paper

19. The most important polysaccharide which is found stored in plant cells is the

(A) Starch

(B) Glucose

(C) Glycogen

(D) Cellulose

20. Carbohydrates which are usually branched molecules, tasteless and insoluble in water, are called

(A) Riboses

(B) Starches

(C) Maltoses

(D) Galactoses A c

21.n plant cell the excess of glucose is converted into

(A) Cellulose

(B) Galactose

(C) Sucrose

(D) starch

22. The most important polysaccharide which is found stored as reserved food in animal cells is the

(A) Starch

(B) Glucose

(C) Glycogen

(D) Cellulose

23. Glyceraldehyde is one example of a group of sugars called

(A) Triose

(B) Tetrose

(C) Octose

(D) Pentose

24. In animal cells polysaccharides are stored in the form of

(A) Oil

(B) Sugars

(C) Glycogen

(D) Starch

25. Glycogen is chemically

(A) Monosaccharide

(B) Disaccharide

(C) Oligosaccharide

(D) Polysaccharide

26. The most abundant carbohydrate in nature is the

(A) Glucose

(B) Cellulose

(C) Sucrose

(D). Maltose

27. Cotton fiber is purely

(A) Galactose

(B) Sucrose

(C) Cellulose

(D) Glucose

28. Lipids are not important dietary constituents because of

(A) Low energy value

(B) Soluble in organic solvent

(C) Essential fatty acids .

(D) Soluble in H2O

29. Which one of the following is lipoprotein in chemical structure?

(A) Cell wall

(B) Ribosome

(C) Cell membrane

(D) Chromosomes

30. What is the percentage of lipids in bacterial cell per total cell weight?

(A) 0.5

(B) 1.0

(C) 2

(D) 2.5

31. Chemical composition of cell membrane is mostly

(A) Lipids and protein

(B) Carbohydrate and fats

(C) Lipids and carbohydrates

(D) Protein and carbohydrate

32. Cholesterol belongs to the group

(A) Carbohydrate

(B) Protein

(C) Lipids

(D) Nucleic acids

33. Neutral lipids are also called

(A) Poly nucleotides

(B) Terpenoides

(C) Triglycerides

(D) Poly peptides

34. Acylglycerol are composed of

(A) Phospholipid

(B) Fatty acid

(C) Protein and glycerol

(D) Glycerol and fatty acid

35. Acylglycerols are chemically composed of

(A) Glycerol and fatty acid

(B) Glycerol and amino acid

 (C) Glycerol and nucleic acid

(D) Glycerol and inorganic acid

36. Which one of the following is not a carbohydrate?

(A) Cellulose

(B) Starch

(C) Acylglycerol

(D) Glucose

37. Rubber, carotenoid, steroid, terpenes are some of the common

(A) Terpenoids

(B) Phospholipids

(C) Carbohydrates

(D) Protein

38. A suitable example of terpenoides is

(A) Sugars

(B) Waxes

(C) Starches

(D) Steroids

39. In the primary structure of a protein, amino acids are joined together by

(A) peptide bonds

(B) phosphodiester bonds

(C) glycosidic bonds

(D) hydrophobic bonds

40. During protein synthesis, transfer RNA

(A) transfers genetic information from the nucleus to the cytoplasm

(B) binds to condons on a mRNA to determine where the amino acid carried on the tRNA belongs in tit: protein

(C) transfers completed proteins from the nucleus to the cytoplasm

(D) binds to DNA to pick up genetic information which is then used by ribosomes in the cytoplasm to assemble proteins.

41. The condons which specify the sequence of amino acids in a protein occur in

(A) rRNA

(B) mRNA

(C) tRNA

(D) ribosomes

42. The second most abundant organic compound in plant and animal cells is

(A) Carbohydrate

(B) Phospholipid

(C) Lipid

(D) Protein

43. In the contraction of muscles, digestion of food and clotting of blood, the key role is played by

(A) Water

(B) Protein

(C) Enzyme ,

(D) Minerals

44. What is the percentage of protein in mammalian per total cell weight?

(A) 18

(B) 12

(C) 25

(D) 15

45. The skin muscles, chemically

(A) Inorganic salts

(B) Lipids

(C) Proteins

(D) Carbohydrates

46. Hair on the human hands are chemically

(A) Nucleon proteins

(B) Lip proteins

(C) Proteins

(D) Glyco.proteins

47. Which of the following is involved in the contraction of muscles?

(A) Carbohydrate

(B) Lipids

(C) Protein

(D) Phospholipid

48.Haemoglobin is a protein composed of

(A) Three alpha and one beta chains

(B) Three beta and one alpha chains

(C) Two alpha and two beta chains

(D) Three alpha and two beta chains

(D) 15 hair and nails in animals and

49. The shape of haemoglobin molecule is like a

(A) Fiber

(B) Cigar

(C) Globe

(D) Saucer

50. In protein synthesis transfer RNA, picks up amino acids and transfers them to

(A) Lysosomes

(C) Mesosomes

(B) Ribosome

(D) Dictyosomes

51. Peptide bond is a

(A) C — N link

(B) C — 0 link

(C) N — H link

(D) C — H link

52. Globular proteins differ from fibrous proteins in

(A) having amino acids

(B) their repeating units joined by peptide bond

(C) being soluble in aqueous medium

(D) being non-crystalline

53. Which of the following has the most chemical elements present in all proteins?

(A) Nitrogen only

(B) Hydrogen and nitrogen

(C) Nitrogen and oxygen

(D) Hydrogen, nitrogen and oxygen

54. Which one of the following is the chief use of protein in the body?

(A) A source of urea

(B) A source of energy

(C) A growth material

(D) A bone salt

55. Amino acids are joined to each other to form polypeptides by condensation (dehydration synthesis) of the functional group on the amino acid at the growing end of the polypeptide with the functional group on the next amino acid to be added to the chain.

(A) carboxyl, hydroxyl

(B) hydroxyl, carboxyl

(C) carboxyl, amino

(D) hydroxyl, hydroxyl

56. The sequence of amino acids in a polypeptide chain is the structure of the protein.

(A) primary

(B) secondary

(C) tertiary

(D) quaternary

57. The number of different kinds of amino acids occurring in a protein molecule is

(A) 10

(B) 20

(C) 30

(D) 40

58. What is the number of amino acids in alpha chain of haemoglobin?

(A) 140

(B) 141

(C) 146

 (D) 147

59. An amino acid has at least one amino (-NH2) and one carboxyl (-COOH) group bounded to the same carbon atom called

(A) Alpha carbon

(B) Beta carbon

(C) Secondary carbon

(D) Tertiary carbon

60. What is the number of amino acids in an insulin molecule?

(A) 21

(B) 30

(C) 41

(D) 51

61. A chain containing three amino acids is called

(A) Dipeptide

(B) Tripeptide

(C) PentaPeptide

(D) Polypeptide

62. What is the total number of amino acids in human haemoglobin?

(A) 571

(B) 572

(C) 574

(D) 576

63. What is the total number of different amino acids that form most of the protein molecules?

(A) 15

(B) 20

(C) 25

(D) 30

64. In animals the fatty acids are in

(A) Branched chain

(B) Straight chain

(C) Ring

(D) Ring and straight chain

65. Oleic-acid is a common example of

(A) Unsaturated fatty acid

(B) Saturated fatty acid

(C) Super saturated fatty acid

(D) None of the above

66. What is the total number of carbon atoms in a molecule of palmitic acid?

(A) 14

(B) 15

(C) 16

(D) 17

67. Hormones are mostly composed of

(A) Amino acids

(B) Fatty acids

(C) Inorganic acids

(D) Nucleic Acids

68. Insulin has 51 amino acids, arranged in how many polypeptide chains?

(A) One

(B) Two

(C) Three

(D) Four

69. There are three hydrogen bonds between

(A) Cytosine and Guanine

(B) Adenine and thiamin

(C) Adenine and uracil

(D) Thiamin and uracil

70. Amino acids are arranged in proper sequence during protein synthesis according to the instructions transcribed on

(A) Transfer RNA

(B) Ribosomal RNA

(C) Messenger RNA

(D) DNA

71.  DNA Messenger RNA receives its instructions from

(A) ribosomes

(C) DNA in the nucleus

(B) endoplasmic reticulum

(D) Cytoplasm

72.  ATP is a

(A) Polysaccharide

(B) Fat

(C) Nucleotide

(D) Protein

73. A molecule containing pyrimidines is a ribose, phosphate, purines, and

(A) Protein

(B) Phospholipid

(C) Carbohydrate

(D) Nucleic acid

74. Energy is routinely released from ATP (in cells) by

(A) converting the entire molecule to CO2 and water

(B) hydrolyzing the adenine from the ribose

(C) hydrolyzing one or two phosphates from the molecules

(D) None of the above

75. If one strand of a DNA molecule contains the sequence 3'A-C-G-T-A5', the other strand of the DNA molecule could contain the sequence   at the same location.

(A) 3'A-C-G-T-AS'

(C) 5'T-G-C-A-T3'

(B) 3'A-C-G-U-A5'

(D) 5'U-G-C-A-U3'

76. Transfer RNA carries _____ to the site of_____  synthesis.

(A) nucleotides, DNA

(B) nucleotides, RNA

(C) amino acids, protein

(D) amino acids, DNA

77. Most amino acids are specified by condons containing  in mRNA.

 (A) a single nucleotide

(B) pairs of nucleotides

(C) triplets of nucleotides

(D) sets of four nuclotides

78. Basic unit of nucleic acid is a

(A) Nucleotide

(B) Pentose sugar

(C) Phosphate group

(D) Purine or pyrimidine

79. Which of the following is not found in DNA?

(A) Sugar

 (B) Uracil

(C) Nitrogen bases

(D) Phosphate

80. Chemically DNA differs from RNA in one of the following:

(A) Adenine present in DNA and Guanine present in RNA.

(B) Deoxyribose and thymine present in DNA while ribose and uracil present in RNA.

(C) Ribose and thymine are present in DNA while deoxyribose and uracil are present in RNA. (D) Guanin in DNA and cytosine in RNA.

81. Nucleic acids are polynucleotide chains in which unit, known as nucleotides are linked to each by

(A) Hydrogen bonding.

(B) Peptide linkage

(C) Ester linkage.

(D) Covalent bond.

82. The melting point of palmitic acid is

(A) 70°C

(B) 72°C

(C) 80°C

(D) 73°C

83. Nucleic acids are made up of

(A) Pyrimidines

(B) Purines

(C) Nucleotides

(D) Phosphates

 84. In RNA, the nitrogenous base thymine of DNA is replaced by

(A) Adenine

(B) Uracil

(C) Cytosine

(D) Guanine

85. The number of strands in a molecule of DNA is

(A) two

(B) four

(C) three

(D) one

86. Which one of the following combinations represents a typical nucleotide?

(A) Phosphoric acid, pentose, sugar and nitrogenous base

(B) Nitrogenous base and pentose sugar

(C) Phosphoric acid and nitrogenous base

(D) Pentose sugar and phosphoric acid

87. The two helices of DNA are held together by

(A) Phosphodiester linkage

(B) Glycoside linkage

(C) Weak hydrogen bonds

(D) Peptide bonds

88. What is the amount of DNA in a germ cell of chicken?

(A) Equal to the amount of somatic cell

(B) Half the amount of somatic cell

(C) Double the amount of somatic cell

(D) One-third the amount of somatic cell

89. The evidence that DNA is the genetic material came first from studies on which of the following organisms?

(A) Rhizobium

(B) Pneumococcus

(C) Clostridium

(D) E. Coli

90. DNA contains all the following nitrogenous base units except

(A) Adenine

(B) Guanine

(C) Cytosine

(D) Uracil

91. What is the hereditary material in the cell?

(A) RNA

(B) DNA

(C) Protein

(D) Amino acid

92. Which of the following is a complete monomeric unit of DNA?

(A) Nucleotide

(B) Pentose sugar

(C) Phosphoric acid

(D) Purine base

93. All of the following are pyrimidine bases except

(A) Guanine

(B) Uracil

(C) Thymine

(D) Cytocine

94. In the living cells the best solvent is the

(A) Alcohol

(B) Ether

(C) Water

(D) Acetone

95. An amino acid contains at least one carboxyl group bounded to the same

(A) Carbon atom

(B) Hydrogen atom

(C) Nitrogen atom

(D) Oxygen atom

96. The growth and reproduction of a living cell depends on its

(A) Cytoplasm

(B) Mitochondria

(C) Nucleus

(D) Nucleolus

97. The structural rings formed by the ribose the solution state are known as

(A) Glucopyranose

(B) Isoprenoid

(C) Ribofiiranose

(D) Glucose

98. Nitrogenous bases such as choline, ethanolamine serine are important components of

(A) Phosphodiester

(B) Phosphatidylcholine

(C) Phospholipids

(D) Sphingolipids

99. Ribose sugar is one of the common

(A) Trioses,_

(C) Pentoses

(B) Tetroses

(D) Heptoses

100.Acylglycerols are the lipids which are composed of  glycerol and

(A) Acetic acid

(B) Fatty acids

(C) Butryic acid

(D) Glyceric acid

1. D 2. D 3. C 4. C 5. A 6. C 7. C 8. B 9. D 10. A, 11. C 12. A 13. C 14. C 15. D 16. D 17. • B 18. A 19. A 20. B 21. D 22. C 23. A 24. C 25. D 26. B 27. C 28. B 29. C 30. C 31. A 32. C 33. C 34. D 35. A 36. C 37. A 38. D 39. A 40. B 41. B 42. D 43. B 44. A 45. C 46. C 47. C 48. 49. C 50. B 51. A 52. C 53. D 54. C 55. C 56. 57. B 58. B 59. A 60. D 61. A 62. C 63. B 64. B 65. A 66. C 67. A 68. B 69. A 70. B 71. C 72. C 73. D 74. C 75. C 76. C 77. C -8. _ 79. B 80. B 81. C 82. A 83. C 84. B 85. A 86. 87. C 88. B 89. B 90. D 91. B 92. A 93. A 94. C 95. A 96. C 97. C 98. C 99. C 100. B

Online MCQS Preparation (MCAT Biology Book-1) Chapter No.2

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