151. The F1 particle:
Answer: B. projects into the matrix and catalyses ATP synthesis
Biology Class 11 Unit 4: Bioenergetics MCQs
222 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. Oxidation of one NADH produces:
Answer: B. 3 ATP
153. Oxidation of one FADH2 produces:
Answer: A. 2 ATP
154. The theory of ATP production by the proton gradient is called:
Answer: C. chemiosmosis
155. Direct synthesis of ATP from an organic phosphorylated substrate is:
Answer: C. substrate level phosphorylation
156. Out of 36 ATP in aerobic respiration, the number from substrate level phosphorylation is:
Answer: B. 4
157. The number of ATP produced by chemiosmosis in the ETC is:
Answer: C. 32
158. The ATP yield from glycolysis of NADH is lower in eukaryotes because:
Answer: B. mitochondria are impermeable to NADH so electrons enter via FAD to form FADH2
159. G3P is an important intermediate of:
Answer: C. both respiration and photosynthesis
160. In the Calvin cycle G3P molecules are converted into:
Answer: B. glucose phosphate within the chloroplast
161. When fat is used as an energy source it breaks down to:
Answer: B. glycerol and three fatty acids
162. Glycerol is converted into:
Answer: B. G3P
163. Fatty acids are converted to:
Answer: C. acetyl CoA that enters the Krebs cycle
164. An 18-carbon fatty acid yields how many acetyl CoA molecules?
Answer: C. 9
165. The removal of the amino group from an amino acid is called:
Answer: B. deamination
166. The amino group becomes ammonia, which enters the:
Answer: C. urea cycle
167. Photorespiration is:
Answer: B. light dependent uptake of oxygen and release of CO2 in green plant cells, without ATP production
168. Photorespiration needs:
Answer: B. oxygen
169. Photorespiration starts when the CO2 level in the leaf drops to about:
Answer: C. 50 ppm
170. In photorespiration RuBisCO combines RuBP with:
Answer: B. O2
171. The toxic 2-carbon molecule formed in photorespiration is:
Answer: C. phosphoglycolate
172. Phosphoglycolate is converted to:
Answer: B. glycolate
173. Glycolate is transported to the:
Answer: C. peroxisome
174. Photorespiration involves which organelles?
Answer: B. Chloroplast, peroxisome and mitochondrion
175. Glycine is converted to serine in the:
Answer: C. mitochondrion
176. In most plants photorespiration reduces the amount of carbon fixed by about:
Answer: B. 25 percent
177. Photorespiration is more serious in:
Answer: C. tropical climates
178. RuBisCO has both:
Answer: B. carboxylase and oxygenase activity
179. Photorespiration started to occur when:
Answer: B. oxygen began to accumulate in the atmosphere
180. Stomata closed in hot dry conditions lead to:
Answer: B. a rise in the O2 to CO2 ratio and photorespiration
181. The additional pathway of some tropical plants to avoid photorespiration is the:
Answer: C. Hatch-Slack cycle (C4 pathway)
182. In C4 plants CO2 is first fixed by:
Answer: B. PEP carboxylase
183. In the C4 pathway CO2 is fixed to PEP to form:
Answer: B. oxaloacetate (4C)
184. The C4 first fixation occurs in the:
Answer: C. mesophyll cell cytoplasm
185. Oxaloacetate is converted to malate and transported to:
Answer: B. bundle sheath cells
186. In bundle sheath cells malate is converted to pyruvate with the release of:
Answer: B. CO2
187. The Calvin cycle in C4 plants occurs in the:
Answer: B. bundle sheath cells
188. Which of these is a C4 plant?
Answer: C. Maize
189. Sugarcane and sorghum are:
Answer: B. C4 plants
190. Pyruvate re-enters mesophyll cells and regenerates PEP using:
Answer: B. one ATP
191. Electrons removed from reduced carbon compounds are mostly transferred to:
Answer: B. NAD plus to produce NADH
192. The detachment of the phosphate group from ATP drives:
Answer: B. endergonic reactions
193. Energy-releasing reactions are called:
Answer: B. exergonic
194. Why do mitochondria not take up cytosolic NADH?
Answer: B. The inner membrane is impermeable to NADH
195. The graph he draws is called the:
Answer: B. action spectrum
196. The plant appears green because it:
Answer: B. reflects green light
197. The oxygen released comes from:
Answer: C. water
198. Which instrument would give the exact absorption of a pigment?
Answer: B. Spectrophotometer
199. The level of RuBP will:
Answer: B. increase
200. The level of PGA will:
Answer: A. decrease
About Biology Class 11 Unit 4 MCQs (Federal Board)
These 222 Biology MCQs cover Class 11 Unit 4: Bioenergetics 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.