101. How many amino acids are commonly found in proteins?
Answer: B. 20
Biology Class 11 Unit 2: Molecular Biology (Biological Molecules) MCQs
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102. The group attached to the alpha carbon of an amino acid that differs among amino acids is the:
Answer: C. R group
103. The two simplest amino acids are:
Answer: B. glycine and alanine
104. The number of essential amino acids is:
Answer: B. 9
105. Which is an essential amino acid?
Answer: C. Lysine
106. Which of the following is a non-essential amino acid?
Answer: C. Proline
107. The number of non-essential amino acids listed in the book is:
Answer: B. 11
108. The bond between two amino acids is the:
Answer: C. peptide bond
109. A peptide bond forms between the:
Answer: B. C of the carboxyl group and N of the amino group
110. The formation of a polypeptide on the ribosome under instructions of mRNA is called:
Answer: C. translation
111. Peptide bonds are broken in the gut by:
Answer: C. pepsin and trypsin
112. The primary structure of a protein is:
Answer: B. a linear sequence of amino acids
113. Alpha helix and beta-pleated sheet are:
Answer: B. secondary structures held by hydrogen bonds
114. A protein with more than one polypeptide, held by hydrophobic interactions, shows:
Answer: D. quaternary structure
115. Haemoglobin is made of:
Answer: B. four polypeptide chains: two alpha and two beta
116. Each alpha chain of haemoglobin has how many amino acids?
Answer: B. 141
117. Each beta chain of haemoglobin has how many amino acids?
Answer: B. 146
118. Sickle cell anaemia is caused by a point mutation which replaces:
Answer: B. glutamic acid by valine at position 6 of beta chain
119. Sickle cell haemoglobin is symbolized as:
Answer: B. HbS
120. Fibrous proteins are:
Answer: B. insoluble in water, elastic and cannot be crystallized
121. Which is a fibrous protein?
Answer: C. Keratin
122. Which is a globular protein?
Answer: C. Enzyme
123. Globular proteins exist in:
Answer: C. tertiary or quaternary structure
124. The structural protein that forms the matrix of bone and cartilage is:
Answer: C. collagen
125. Keratin strengthens:
Answer: B. hair, nails, feathers and horns
126. Histone proteins function to:
Answer: B. arrange DNA into chromosomes
127. Fibrinogen is involved in:
Answer: B. blood clotting
128. Ovalbumin and casein are involved in:
Answer: B. storage of amino acids
129. The Biuret test for proteins gives a:
Answer: B. pink or violet colour
130. Lipids are soluble in:
Answer: B. organic solvents like acetone and ether
131. Lipids contain relatively:
Answer: B. less oxygen in proportion to carbon and hydrogen than carbohydrates
132. Lipids provide about how much energy compared with carbohydrates?
Answer: C. Double
133. Acylglycerols are esters of:
Answer: B. glycerol and fatty acids
134. Glycerol is a:
Answer: B. trihydroxy alcohol with three carbons
135. The reaction between an alcohol and an acid to form an ester is:
Answer: B. esterification
136. Triglycerides are called neutral lipids because:
Answer: B. all three OH groups of glycerol are occupied by fatty acids
137. Fatty acids found in lipids have:
Answer: B. even number of carbons
138. The 16-carbon saturated fatty acid is:
Answer: C. palmitic acid
139. The 18-carbon saturated fatty acid is:
Answer: A. stearic acid
140. Oleic acid is:
Answer: B. an unsaturated fatty acid with one double bond
141. Saturated fatty acids are:
Answer: B. solid at room temperature and common in animal fats
142. Tristearin melts at 71 degrees Celsius while triolein melts at:
Answer: C. minus 17 degrees
143. Hydrogenation of acylglycerols produces:
Answer: B. margarine
144. Natural waxes are esters of:
Answer: B. long chain fatty acids and long chain alcohols
145. Beeswax and cutin are examples of:
Answer: C. natural waxes
146. Phospholipids are amphipathic, which means they have:
Answer: C. both a polar and a non-polar region
147. A phospholipid is formed when phosphatidic acid combines with:
Answer: B. choline, ethanolamine, inositol or serine
148. Lecithin is chemically:
Answer: B. phosphatidylcholine
149. The hydrophilic head of a phospholipid contains the:
Answer: B. phosphate group and the additional compound
150. Terpenes are synthesized from a five-carbon unit called:
Answer: B. isoprene
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.