51. In glucopyranose the ring oxygen links:
Answer: C. C1 and C5
Biology Class 11 Unit 2: Molecular Biology (Biological Molecules) MCQs
235 multiple choice questions with the correct answer for each. Tap an option to check yourself, or switch on "Show all answers". This is page 2 of 5.
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52. Ribose in solution forms a ring called:
Answer: B. ribofuranose
53. Monosaccharides are called reducing sugars because they have:
Answer: B. a free aldehyde or ketone group that can donate electrons
54. Glucose and fructose are examples of:
Answer: C. functional (structural) isomers
55. The number of stereoisomers of a monosaccharide is calculated by:
Answer: C. 2 raised to n, where n is the number of asymmetric carbons
56. The number of stereoisomers of glucose is:
Answer: C. 16
57. An asymmetric carbon is one which:
Answer: B. is bonded to four different atoms or groups
58. Anomers differ in the position of -OH at:
Answer: C. C-1 (anomeric carbon)
59. In alpha glucose the -OH on C-1 is:
Answer: B. downward
60. Non-superimposable mirror image stereoisomers are called:
Answer: C. enantiomers
61. In D-glucose the -OH of the penultimate carbon (C-5) is on the:
Answer: B. right side
62. Stereoisomers that differ at only ONE asymmetric carbon are:
Answer: C. epimers
63. D-glucose and D-mannose are:
Answer: C. epimers
64. Living organisms can use only:
Answer: B. D-sugars
65. Artificial sweeteners like sucralose are left-handed sugars so they are:
Answer: B. not metabolized by right-handed enzymes
66. The general formula of disaccharides is:
Answer: B. C12H22O11
67. Cane sugar is chemically:
Answer: C. sucrose
68. On hydrolysis, sucrose yields:
Answer: B. one alpha-glucose and one beta-fructose
69. The transport sugar in plants is:
Answer: C. sucrose
70. Malt sugar is also called:
Answer: C. maltose
71. Maltose is formed from:
Answer: C. two alpha-glucose molecules
72. Lactose is formed from:
Answer: C. beta-galactose and beta-glucose
73. Milk sugar content is highest in:
Answer: C. human milk
74. The glycosidic bond in maltose is:
Answer: A. alpha-1,4
75. The glycosidic bond in sucrose is:
Answer: B. alpha-1,2
76. The glycosidic bond in lactose is:
Answer: C. beta-1,4
77. Which disaccharide is a non-reducing sugar?
Answer: C. Sucrose
78. Polysaccharides yield on hydrolysis:
Answer: C. more than 10 monosaccharides
79. Which is a homopolysaccharide?
Answer: B. Starch
80. Starch is made of condensation of:
Answer: C. alpha-glucose
81. Iodine solution gives blue-black colour with:
Answer: C. starch
82. Iodine solution gives a red colour with:
Answer: C. glycogen
83. Which of the following shows no colour with iodine?
Answer: C. Cellulose
84. Amylose is a:
Answer: B. linear unbranched chain of glucose joined by alpha-1,4 bonds
85. The branches of amylopectin are attached by:
Answer: C. alpha-1,6 bonds
86. Glycogen is stored mainly in:
Answer: B. liver and muscles
87. Glycogen is also called:
Answer: B. animal starch
88. Which has the most branching?
Answer: C. Glycogen
89. Cellulose is made up of:
Answer: B. beta-glucose joined by beta-1,4 bonds
90. The most abundant carbohydrate on earth is:
Answer: C. cellulose
91. Cellulose in the human diet works as:
Answer: B. roughage (fibre)
92. Herbivores digest cellulose with the help of:
Answer: B. symbiotic bacteria secreting cellulase
93. Chitin is a polymer of:
Answer: C. N-acetylglucosamine
94. Chitin is found in:
Answer: B. fungal cell walls and the exoskeleton of arthropods
95. The second most abundant organic molecule on earth is:
Answer: C. chitin
96. The iodine test for starch gives:
Answer: B. dark blue-black colour
97. Benedict's test detects:
Answer: C. reducing sugars such as glucose
98. In Molisch's test the colour of the ring formed at the junction is:
Answer: C. purple
99. Which elements are present in ALL proteins?
Answer: B. C, H, O, N
100. Proteins are polymers of:
Answer: C. amino acids
About Biology Class 11 Unit 2 MCQs (Federal Board)
These 235 Biology MCQs cover Class 11 Unit 2: Molecular Biology (Biological Molecules) of the Federal Board (FBISE) HSSC-I (1st Year / Class 11) syllabus. They are SLO-based MCQs as per the new pattern for FBISE exams. Each question has four options and the correct answer is shown, so you can practise for the annual examination and find the topics you still need to revise. The questions are split over 5 pages of 50. Use the Print button to save this chapter as a PDF.