151. Two isoprene units form a:
Answer: A. monoterpene
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 4 of 5.
Tap an option to check your answer.
152. Natural rubber is a:
Answer: D. polyterpene
153. Menthol is an example of a:
Answer: A. monoterpene
154. Vitamin A and phytol (chlorophyll tail) are:
Answer: B. diterpenes
155. The steroid nucleus has how many carbon atoms in four fused rings?
Answer: C. 17
156. The steroid nucleus rings are:
Answer: B. three six-carbon rings and one five-carbon ring
157. The precursor of bile acids, testosterone, progesterone and estrogen is:
Answer: B. cholesterol
158. Prostaglandins are derived from:
Answer: B. arachidonic acid
159. Aspirin reduces fever and pain by inhibiting the synthesis of:
Answer: B. prostaglandins
160. Nucleic acids were first reported in 1869 by:
Answer: C. a Swiss physician (Miescher), from pus cells
161. The monomers of nucleic acids are:
Answer: C. nucleotides
162. A nucleoside consists of:
Answer: B. base and pentose sugar
163. The nitrogenous base is linked to which carbon of the pentose sugar?
Answer: C. 1 prime
164. The phosphate group is linked to which carbon of the sugar?
Answer: C. 5 prime
165. Pyrimidine bases are:
Answer: B. cytosine, thymine and uracil
166. Purine bases are:
Answer: A. adenine and guanine
167. The base found only in RNA is:
Answer: C. uracil
168. The base found only in DNA is:
Answer: A. thymine
169. Adenosine is a:
Answer: B. ribonucleoside
170. The bond that joins nucleotides in a polynucleotide chain is the:
Answer: C. phosphodiester bond
171. In polymerization of nucleotides the molecule released is:
Answer: B. pyrophosphate
172. A polynucleotide has a free phosphate at one end and a free hydroxyl at the other, which are:
Answer: B. 5 prime phosphate and 3 prime OH
173. ATP is a:
Answer: B. mononucleotide
174. The covalent bonds linking the phosphates in ATP are called:
Answer: C. high-energy bonds
175. NAD is a:
Answer: B. dinucleotide coenzyme
176. Chargaff's rule states that:
Answer: B. the amount of A equals T and G equals C
177. X-ray diffraction of DNA was done by:
Answer: C. Maurice Wilkins and Rosalind Franklin
178. The Watson and Crick model of DNA was published in:
Answer: C. 1953
179. The width of the DNA double helix is:
Answer: C. 2 nm
180. The length of one turn of the DNA helix is:
Answer: C. 3.4 nm
181. One turn of the DNA helix contains:
Answer: B. 10 base pairs
182. The two strands of DNA are:
Answer: B. antiparallel and complementary
183. Watson and Crick received the Nobel Prize for the DNA model in:
Answer: C. 1962
184. RNA is generally:
Answer: B. single stranded
185. Sugar in RNA is:
Answer: B. ribose
186. The RNA that carries genetic message from nucleus to ribosome is:
Answer: C. mRNA
187. A group of three nucleotides in mRNA coding for an amino acid is a:
Answer: B. codon
188. The mRNA for a protein of 100 amino acids will be how many nucleotides long?
Answer: C. 300
189. The RNA that makes up about 80 percent of the total cellular RNA is:
Answer: B. rRNA
190. The smallest RNA, with 75 to 90 nucleotides, is:
Answer: C. tRNA
191. tRNA has the shape of a:
Answer: B. cloverleaf
192. The 3 prime end of tRNA always ends with the sequence:
Answer: C. CCA
193. The amino acid attaches to the tRNA at its:
Answer: C. 3 prime CCA end
194. The anticodon of tRNA is complementary to the:
Answer: B. codon of mRNA
195. The flow of information DNA to RNA to protein is called the:
Answer: B. central dogma
196. The synthesis of RNA from a DNA template is:
Answer: B. transcription
197. In transcription, adenine in DNA pairs with which base in mRNA?
Answer: C. Uracil
198. Translation takes place on the:
Answer: B. ribosome
199. Transcription and translation together are known as:
Answer: B. gene expression
200. Glycolipids are found in:
Answer: B. white matter of the brain, myelin sheath and chloroplast membrane
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.