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.
| 101. |
The TCA cycle is regulated by which of the following enzymes? |
| A. | citrate synthase |
| B. | isocitrate dehydrogenase |
| C. | malate dehydrogenase |
| D. | succinate dehydrogenase |
| Answer» C. malate dehydrogenase | |
| 102. |
Protein molecules can easily pass into the cell for being utilized for energy production. |
| A. | True |
| B. | False |
| C. | May be |
| D. | Can't say |
| Answer» C. May be | |
| 103. |
Age, Gender, Body size and climate determine the |
| A. | growth rate of an individual |
| B. | basal metabolic rate |
| C. | basal hydrolysis rate |
| D. | pressure influence on growth rate |
| Answer» C. basal hydrolysis rate | |
| 104. |
Which of the following pathway is common for oxidation of carbohydrates, lipids and amino acids? |
| A. | Calvin cycle |
| B. | Electron transport chain |
| C. | TCA cycle |
| D. | Pentose phosphate pathway |
| Answer» D. Pentose phosphate pathway | |
| 105. |
Phosphoenolpyruvate (PEP) is converted to oxaloacetate by the enzyme PEP deaminase. |
| A. | True |
| B. | False |
| C. | May be |
| D. | Can't say |
| Answer» C. May be | |
| 106. |
If ΔG of a chemical reaction has a negative value, the reaction |
| A. | releases energy |
| B. | requires energy |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» B. requires energy | |
| 107. |
How many oxygen molecules are required in the fermentation of one molecule of glucose to ethanol and CO2? |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 36 |
| Answer» B. 1 | |
| 108. |
DNA gyrase is a ______________ protein. |
| A. | helix-unwinding |
| B. | helix-destabilizing |
| C. | helix-relaxing |
| D. | helix-winding |
| Answer» D. helix-winding | |
| 109. |
Standard free energy change (ΔG) can be expressed as |
| A. | ΔG° = -RTlnkeq |
| B. | ΔG° = RTlnkeq |
| C. | ΔG° = R/Tlnkeq |
| D. | ΔG° = -RT/lnkeq |
| Answer» B. ΔG° = RTlnkeq | |
| 110. |
The chromosome of a typical bacterium is ________________ |
| A. | circular double-stranded DNA |
| B. | circular single-stranded DNA |
| C. | double-helix DNA |
| D. | single stranded DNA |
| Answer» B. circular single-stranded DNA | |
| 111. |
The amount of energy (cal/mole) in an ATP molecule produced by a cell from glucose by fermentation is |
| A. | greater than aerobic metabolism |
| B. | less than aerobic metabolism |
| C. | exactly or approximately equal to aerobic metabolism |
| D. | none of the above |
| Answer» D. none of the above | |
| 112. |
In anaerobic respiration, the final electron acceptor can be |
| A. | oxygen |
| B. | nitrate |
| C. | pyruvate |
| D. | acetyl-CoA |
| Answer» C. pyruvate | |
| 113. |
Physically tiring jobs may result in basal metabolic rate of |
| A. | 480 kJ |
| B. | 850 kJ |
| C. | 1500 kJ |
| D. | 2050 kJ |
| Answer» E. | |
| 114. |
DAHP synthetase catalyzes the condensation of |
| A. | erythrose-4-phosphate |
| B. | phosphoenol pyruvate |
| C. | both (a) and (b) |
| D. | phenylalanine |
| Answer» D. phenylalanine | |
| 115. |
How many ATPs are paid back during Pentose phosphate Pathway? |
| A. | 1 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» B. 3 | |
| 116. |
Which of the following acts as chemical reductant in bacterial photosynthesis? |
| A. | oxygen |
| B. | water |
| C. | hydrogen sulphide |
| D. | ammonia |
| Answer» D. ammonia | |
| 117. |
The region in which bacteriochlorophyll can absorb light is _________ |
| A. | ultraviolet region |
| B. | infrared region |
| C. | visible region |
| D. | microwave region |
| Answer» C. visible region | |
| 118. |
The enzymes present in glyoxylate cycle are which type of enzymes? |
| A. | reductase enzymes |
| B. | anaplerotic enzymes |
| C. | transferase enzymes |
| D. | hydrolase enzymes |
| Answer» C. transferase enzymes | |
| 119. |
Which molecule will combine with the four-carbon oxaloacetate in the TCA cycle to form the six-carbon citrate? |
| A. | lactic acid |
| B. | NADH |
| C. | ATP |
| D. | acetyl-CoA |
| Answer» E. | |
| 120. |
An essential process connected with photosynthesis is |
| A. | photolysis |
| B. | synthesis of glucose |
| C. | photophosphorylation |
| D. | electron transfer |
| Answer» B. synthesis of glucose | |
| 121. |
Chlorobium sp. is which type of bacteria? |
| A. | Purple Sulphur Bacteria |
| B. | Purple Non-sulphur Bacteria |
| C. | Green Sulphur bacteria |
| D. | Green Non-sulphur bacteria |
| Answer» D. Green Non-sulphur bacteria | |
| 122. |
Where are bacteriochlorophyll present in the cell? |
| A. | chloroplast |
| B. | cytoplasm |
| C. | mitochondria |
| D. | membrane |
| Answer» E. | |
| 123. |
Most bacterial fermentations yield how many net ATP molecules per molecule of glucose? |
| A. | 1 |
| B. | 2 |
| C. | 4 |
| D. | 6 |
| Answer» C. 4 | |
| 124. |
High energy transfer compounds are capable of |
| A. | accepting large amounts of free energy |
| B. | transferring large amounts of free energy |
| C. | measuring free energy |
| D. | none of the above |
| Answer» C. measuring free energy | |
| 125. |
The ribosome of E.coli is made up of which two subunits? |
| A. | 60S and 40S |
| B. | 60S and 30S |
| C. | 50S and 40S |
| D. | 50S and 30S |
| Answer» E. | |
| 126. |
In glycolysis, ATP is created by |
| A. | photophosphorylation |
| B. | the chemiosmotic mechanism |
| C. | substrate level phosphorylation |
| D. | the pentose phosphate pathway |
| Answer» D. the pentose phosphate pathway | |
| 127. |
A yeast or fungal cell produces how many net ATP molecules per molecule of glucose when completely oxidized? |
| A. | 32 |
| B. | 34 |
| C. | 36 |
| D. | 38 |
| Answer» D. 38 | |
| 128. |
The enzymes for glycolysis are located |
| A. | on the inner surface of the cell membrane |
| B. | on the inner membrane of the mitochondrion |
| C. | on the outer membrane of the chloroplast |
| D. | in the cytoplasm |
| Answer» E. | |
| 129. |
In aerobic respiration, the terminal electron acceptor is |
| A. | oxygen |
| B. | nitrogen |
| C. | hydrogen |
| D. | nitrate |
| Answer» B. nitrogen | |
| 130. |
The acquisition energy by glucose fermentation requires |
| A. | substrate-level phosphorylation |
| B. | electron transport of electrons from NADH |
| C. | long-chain fatty acid oxidation |
| D. | the enzyme formic-hydrogen lyase |
| Answer» B. electron transport of electrons from NADH | |
| 131. |
Free energy change (ΔG) of a reaction is referred as the amount of energy |
| A. | liberated during reaction |
| B. | taken up during reaction |
| C. | liberated or taken up during reaction |
| D. | none of these |
| Answer» D. none of these | |
| 132. |
Which of the following intermediates of TCA cycle act as amino acid precursors? |
| A. | oxaloacetic acid |
| B. | succinic acid |
| C. | citric acid |
| D. | acetyl CoA |
| Answer» B. succinic acid | |
| 133. |
The role of bacteriophyll in an oxygenic photosynthesis is to |
| A. | reduce ferridoxin directly |
| B. | reduce NADP directly |
| C. | use light energy to energize an electron |
| D. | transfer electrons to an intermediate in the sulfide oxidation pathway |
| Answer» D. transfer electrons to an intermediate in the sulfide oxidation pathway | |
| 134. |
In photosynthesis by green plants, algae, cyanobacteria which of the following acts as terminal electron acceptor? |
| A. | Water |
| B. | Oxygen |
| C. | NADP+ |
| D. | FAD+ |
| Answer» D. FAD+ | |
| 135. |
Organisms can synthesize ATP by oxidative phosphorylation when they |
| A. | ferment |
| B. | oxidize glucose to pyruvate |
| C. | pass electrons from the oxidation of chlorophyll through an electron transport system |
| D. | pass electrons to oxygen through an electron transport system containing cytochromes |
| Answer» E. | |
| 136. |
Which force drives the flagellar rotation in bacteria? |
| A. | ATP |
| B. | protonmotive force |
| C. | electrons |
| D. | water gradient |
| Answer» C. electrons | |
| 137. |
The final product of Calvin cycle is _________ |
| A. | RuBP |
| B. | Glucose |
| C. | Dihydroxy acetone phosphate |
| D. | Glyceraldehyde-3-phosphate |
| Answer» E. | |
| 138. |
The dark reaction in photosynthesis is governed by __________ |
| A. | CO2, temperature, and light |
| B. | CO2, light, and water |
| C. | water, temperature, and CO2 |
| D. | oxygen, water, and temperature |
| Answer» B. CO2, light, and water | |
| 139. |
Which of the following has no detectable ATPase activity? |
| A. | cilia |
| B. | eukaryotic flagella |
| C. | bacterial flagella |
| D. | endoflagella |
| Answer» D. endoflagella | |
| 140. |
Which of the following steps during electron transfer in anoxygenic photosynthesis is the ATP production step? |
| A. | Ferredoxin to ubiquinone |
| B. | ubiquinone to cyt b |
| C. | cyt b to cyt f |
| D. | cyt f to excited bacteriochlorophyll |
| Answer» D. cyt f to excited bacteriochlorophyll | |
| 141. |
Which pathway will result in the production of four carbon dioxide molecules, two ATP molecules, NADH2 and FADH2? |
| A. | glycolysis |
| B. | Krebs cycle |
| C. | Calvin cycle |
| D. | electron transport system |
| Answer» C. Calvin cycle | |
| 142. |
For each glucose molecule broken down, there are______________number of reduced coenzymes to be oxidized. |
| A. | 12 |
| B. | 8 |
| C. | 6 |
| D. | 4 |
| Answer» B. 8 | |
| 143. |
Hexose monophosphate pathway is also known as |
| A. | phosphogluconate pathway |
| B. | oxaloacetate pathway |
| C. | malate pathway |
| D. | fumerate pathway |
| Answer» B. oxaloacetate pathway | |
| 144. |
Entner - Doudoroff pathway is not found in |
| A. | aerobic prokaryotes |
| B. | anaerobic prokaryotes |
| C. | Both (a) and (b) |
| D. | eukaryotes |
| Answer» E. | |
| 145. |
Which of the following enzyme removes the RNA primer with its 5’-nuclease activity? |
| A. | DNA polymerase I |
| B. | DNA polymerase II |
| C. | DNA polymerase III |
| D. | RNA polymerase |
| Answer» B. DNA polymerase II | |
| 146. |
Aerobic catabolism of glucose yields how much energy (ATP synthesized) relative to glucose fermentation? |
| A. | Slightly less |
| B. | About the same |
| C. | Twice as much |
| D. | More than 10 times as much |
| Answer» E. | |
| 147. |
Aerobic respiration differs from anaerobic respiration in which of the following respects? |
| A. | Anaerobic respiration is glycolysis |
| B. | Aerobic respiration requires the electron transport chain |
| C. | The final electron acceptors are different |
| D. | Aerobic respiration produces less ATP |
| Answer» D. Aerobic respiration produces less ATP | |
| 148. |
How many molecules of glucose-6-phosphate are regenerated in pentose-phosphate pathway? |
| A. | 3 |
| B. | 2 |
| C. | 5 |
| D. | 4 |
| Answer» D. 4 | |
| 149. |
Which one of the following is produced in the greatest numbers during one turn of the Krebs cycle? |
| A. | NADH |
| B. | Acetyl-CoA |
| C. | FADH2 |
| D. | ATP |
| Answer» B. Acetyl-CoA | |
| 150. |
The specific enzyme/(s) of the glyoxylate cycle is/are |
| A. | isocitrate lyase |
| B. | malate synthase |
| C. | both (a) and (b) |
| D. | anaplerotic |
| Answer» D. anaplerotic | |