MCQOPTIONS
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MCQOPTIONS
This section includes 205 Mcqs, each offering curated multiple-choice questions to sharpen your Life Sciences knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
Which of the following does not produce oxygen as a product of photosynthesis? |
| A. | Oak trees |
| B. | Purple sulfur bacteria |
| C. | Cyanobacteria |
| D. | Phytoplankton |
| Answer» C. Cyanobacteria | |
| 152. |
The following code codes for which of the amino acid respectively?AUG and GUG |
| A. | Phenylalanine,tyrosine |
| B. | Methionine,valine |
| C. | Methionine,alanine |
| D. | Lysine,valine |
| Answer» C. Methionine,alanine | |
| 153. |
The bacteriochlorophylls used by the anoxygenic bacteria have absorbance maxima located in the_____portion(s) of the spectrum. |
| A. | green |
| B. | blue |
| C. | ultraviolet |
| D. | infrared |
| Answer» E. | |
| 154. |
In order to get inorganic phosphorous into organic compounds, the phosphate ion is incorporated via |
| A. | substrate level phosphorylation |
| B. | oxidative phosphorylation |
| C. | both (a) and (b) |
| D. | DNA |
| Answer» D. DNA | |
| 155. |
All are true about Bile, but |
| A. | contain enzymes |
| B. | very quickly digests food |
| C. | is secreted by small intestine |
| D. | is acidic in nature |
| Answer» B. very quickly digests food | |
| 156. |
ATP dependent NADPH2 production is a process found in ______________ |
| A. | Nitrosomonas |
| B. | Nitrobacter |
| C. | Rhizobium |
| D. | E.coli |
| Answer» C. Rhizobium | |
| 157. |
Each turn of Calvin cycle results in the fixation of ________ molecule of carbon dioxide. |
| A. | one |
| B. | two |
| C. | four |
| D. | six |
| Answer» B. two | |
| 158. |
Which of the following acts as a precursor for the activation of peptidoglycan? |
| A. | TP |
| B. | UDP |
| C. | NADPH |
| D. | GTP |
| Answer» C. NADPH | |
| 159. |
Bactoprenol is a ___________ |
| A. | membrane phospholipid |
| B. | amino acid carrier |
| C. | fatty acid |
| D. | enzyme |
| Answer» B. amino acid carrier | |
| 160. |
Electrons entering the respiratory chain of chemoautotrophic bacteria enter the chain at higher potential. |
| A. | True |
| B. | False |
| C. | May be |
| D. | Can't say |
| Answer» B. False | |
| 161. |
The entry of glycerol into the bacterial cells is by ____________ |
| A. | passive diffusion |
| B. | facilitated diffusion |
| C. | group translocation |
| D. | active diffusion |
| Answer» C. group translocation | |
| 162. |
Porter or permease is located in the _______________ |
| A. | cytoplasmic membrane |
| B. | cell membrane |
| C. | nuclear membrane |
| D. | outer membrane |
| Answer» B. cell membrane | |
| 163. |
Facilitated diffusion does not require metabolic energy. |
| A. | True |
| B. | False |
| C. | May be |
| D. | Can't say |
| Answer» B. False | |
| 164. |
Rotary motor of flagella is associated with _________ |
| A. | M ring |
| B. | P ring |
| C. | L ring |
| D. | M and S ring |
| Answer» E. | |
| 165. |
Passive diffusion requires the use of membrane transport proteins for the transport of solute molecules across the membrane. |
| A. | True |
| B. | False |
| C. | May be |
| D. | Can't say |
| Answer» C. May be | |
| 166. |
The reaction for the transfer of phosphoryl group of phosphoenol pyruvate to the sugar molecule requires which ion? |
| A. | Mg^2+ |
| B. | Fe^2+ |
| C. | O |
| D. | PO4^2- |
| Answer» B. Fe^2+ | |
| 167. |
HPr stands for ______________ |
| A. | heat-stable carrier protein |
| B. | hydrogen carrier protein |
| C. | pyruvate dehydrogenase |
| D. | high-energy protein |
| Answer» B. hydrogen carrier protein | |
| 168. |
Mannitol enzyme II has been purified from _____________ |
| A. | E.coli |
| B. | Salmonella typhimurium |
| C. | Saccharomyces cerevisiae |
| D. | Lactobacillus |
| Answer» B. Salmonella typhimurium | |
| 169. |
In phosphotransferase system(PTS), the sugar-phosphate is released inside the cell by which of the following? |
| A. | Enzyme I |
| B. | Enzyme II |
| C. | Enzyme III |
| D. | HPr |
| Answer» C. Enzyme III | |
| 170. |
The biosynthesis of proline takes place from ____________ |
| A. | aspartic acid |
| B. | glutamic acid |
| C. | pyruvic acid |
| D. | alpha-keto glutaric acid |
| Answer» C. pyruvic acid | |
| 171. |
Indigestion, Bile pigments can |
| A. | removed with feces |
| B. | permanently stored in gall bladder |
| C. | contains enzymes |
| D. | absorbed by large intestine |
| Answer» B. permanently stored in gall bladder | |
| 172. |
The step where glyceraldehyde-3-phosphate is oxidized is a substrate-level phosphorylation. |
| A. | True |
| B. | False |
| C. | May be |
| D. | Can't say |
| Answer» C. May be | |
| 173. |
The catabolic reaction, pentose-phosphate exists in |
| A. | prokaryotic cells |
| B. | eukaryotic cells |
| C. | prokaryotic and eukaryotic cells both |
| D. | none of these |
| Answer» D. none of these | |
| 174. |
Which of the following is responsible for the initiation of RNA polymerase activity? |
| A. | initiation site |
| B. | promoter region |
| C. | sigma factor |
| D. | rho factor |
| Answer» D. rho factor | |
| 175. |
In cellular metabolism, O2 is used |
| A. | to provide electrons for photophosphorylation |
| B. | in glycolysis |
| C. | as a terminal electron acceptor |
| D. | in the Krebs cycle |
| Answer» D. in the Krebs cycle | |
| 176. |
Purple Sulphur Bacteria contains bacteriochlorophyll b and bacteriochlorophyll c. |
| A. | True |
| B. | False |
| C. | May be |
| D. | Can't say |
| Answer» C. May be | |
| 177. |
For each pair of electrons passing from NADH located inside the mitochondria to oxygen, how many ATP molecules can be generated? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 178. |
Which of the following is the most complete definition of fermentation? |
| A. | Oxidation of glucose with organic molecules serving as electron acceptors |
| B. | Complete catabolism of glucose to CO2 and HO2 |
| C. | Production of energy by substrate-level phosphorylation |
| D. | Production of ethyl alcohol from glucose |
| Answer» B. Complete catabolism of glucose to CO2 and HO2 | |
| 179. |
The activation of amino acids require energy. |
| A. | True |
| B. | False |
| C. | May be |
| D. | Can't say |
| Answer» B. False | |
| 180. |
Persons lower metabolic rate may be due to |
| A. | the fact that he is a child |
| B. | decrease in saliva amylase |
| C. | the fact the he lives in tropic climate |
| D. | low production of thyroxin |
| Answer» E. | |
| 181. |
Phosphate deregulated mutants are |
| A. | less sensitive to phosphate regulation |
| B. | moderately sensitive to phosphate regulation |
| C. | highly sensitive to phosphate regulation |
| D. | none of these |
| Answer» B. moderately sensitive to phosphate regulation | |
| 182. |
The terminal sequence of nucleotides in all tRNA is __________ |
| A. | ACC |
| B. | UGC |
| C. | UCC |
| D. | AGC |
| Answer» B. UGC | |
| 183. |
In DNA molecule, the amount of purines is equal to the amount of pyrimidines. |
| A. | True |
| B. | False |
| C. | May be |
| D. | Can't say |
| Answer» B. False | |
| 184. |
RuBisCO enzyme plays an important role in __________ |
| A. | light phase |
| B. | dark phase |
| C. | electron transport chain |
| D. | TCA cycle |
| Answer» C. electron transport chain | |
| 185. |
The glyoxylate cycle is used by some microorganisms when___________ is the sole carbon source. |
| A. | acetate |
| B. | nitrate |
| C. | carbon dioxide |
| D. | all of these |
| Answer» B. nitrate | |
| 186. |
If ΔG of a chemical reaction is positive in value and keq is less than 1 then the chemical reaction will |
| A. | proceed in reverse direction |
| B. | proceeed in forward direction |
| C. | not take place in any of the direction |
| D. | none of these |
| Answer» B. proceeed in forward direction | |
| 187. |
The number of ATP molecules generated in TCA cycle is _________ |
| A. | 34 |
| B. | 38 |
| C. | 24 |
| D. | 12 |
| Answer» D. 12 | |
| 188. |
TCA cycle functions in |
| A. | catabolic reactions |
| B. | anabolic reactions |
| C. | amphibolic reactions |
| D. | none of these |
| Answer» D. none of these | |
| 189. |
Basal metabolism, physical activity and heat- all collectively determine the |
| A. | energy intake |
| B. | energy expenditures |
| C. | energy in heart beat |
| D. | energy required to stay emotionally well |
| Answer» C. energy in heart beat | |
| 190. |
Basal metabolic rate of a child is than an old person. |
| A. | higher |
| B. | lower |
| C. | exactly same |
| D. | approximately same |
| Answer» B. lower | |
| 191. |
The prosthetic group of a cytochrome contains how many iron atoms? |
| A. | one |
| B. | two |
| C. | three |
| D. | four |
| Answer» B. two | |
| 192. |
Among the following which can directly react with oxygen? |
| A. | cytochrome c |
| B. | cytochrome c1 |
| C. | cytochrome a |
| D. | cytochrome a3 |
| Answer» E. | |
| 193. |
How many ATP molecules are formed for per molecule of FADH2 reoxidized? |
| A. | 3 |
| B. | 1 |
| C. | 2 |
| D. | 4 |
| Answer» D. 4 | |
| 194. |
Glycolysis can occur in ___________ |
| A. | aerobic cells |
| B. | anaerobic cells |
| C. | both aerobic and anaerobic cells |
| D. | neither aerobic and anaerobic cells |
| Answer» D. neither aerobic and anaerobic cells | |
| 195. |
The respiratory chain of bacteria is associated with the _____________ |
| A. | miitochondrial membrane |
| B. | cytoplasmic membrane |
| C. | cell wall |
| D. | cytoplasm |
| Answer» C. cell wall | |
| 196. |
NAME_THE_INHIBITION_WHERE_END_PRODUCTS_OF_BIOSYNTHESIS_PATHWAY_INHIBIT_THE_ACTIVITY_OF_THE_FIRST_ENZYME??$ |
| A. | Feedback inhibition |
| B. | Feedback repression |
| C. | Allosteric inhibition |
| D. | Competitive inhibition |
| Answer» B. Feedback repression | |
| 197. |
In which of the following phenomenon the end product act as co-repressor and repress the synthesis of metabolic enzymes?$ |
| A. | Allosteric regulation |
| B. | Feedback repression |
| C. | Feedback inhibition |
| D. | Regulation by phosphorylation |
| Answer» C. Feedback inhibition | |
| 198. |
Which of the following is not an enzyme-catalyzed reaction in metabolism? |
| A. | Isomerization and elimination |
| B. | Internal rearrangement |
| C. | Maillard reaction |
| D. | Free radical reaction |
| Answer» D. Free radical reaction | |
| 199. |
Regulation of metabolic pathway is done by following ways except one, mark the one? |
| A. | Substrate concentration |
| B. | Allosteric regulation of enzymes |
| C. | Availability of oxygen |
| D. | Extracellular signals i.e. hormones or growth factors |
| Answer» D. Extracellular signals i.e. hormones or growth factors | |
| 200. |
Mark the INCORRECT statement about metabolic pathway. |
| A. | They show the irreversible pathway |
| B. | Each one of them has first committed step |
| C. | They follow the only oxidative process |
| D. | They are regulated |
| Answer» D. They are regulated | |