MCQOPTIONS
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MCQOPTIONS
This section includes 71 Mcqs, each offering curated multiple-choice questions to sharpen your Microbiology knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
If radioactive bicarbonate was supplied to bacterial cells, which were actively synthesizing fatty acids, it is expected to find the bulk of the radioactivity in |
| A. | cellular bicarbonate |
| B. | the fatty acids |
| C. | the cytoplasmic membrane |
| D. | nucleic acids |
| Answer» B. the fatty acids | |
| 52. |
If G 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 | |
| 53. |
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. | |
| 54. |
The relationship between an oxidation-reduction potential difference and the standard free energy change is (where n is the number of moles of electron transferred, F= Faraday's constant and E = standard oxidation-reduction potential difference) |
| A. | G = -nFE |
| B. | G = nFE |
| C. | G = -nFlnE |
| D. | G = nFlnE |
| Answer» B. G = nFE | |
| 55. |
ATPase |
| A. | synthesizes ATP, coupled to transfer of extracellular protons into the cell |
| B. | extrudes protons from the cell coupled to the hydrolysis of ATP to ADP |
| C. | is the enzyme that incorporates ATP into messenger RNA |
| D. | carries out each of the reactions indicated in (a) and (b) |
| Answer» E. | |
| 56. |
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 | |
| 57. |
Entner - Doudoroff pathway is not found in |
| A. | aerobic prokaryotes |
| B. | anaerobic prokaryotes |
| C. | Both (a) and (b) |
| D. | eukaryotes |
| Answer» E. | |
| 58. |
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. | |
| 59. |
Phosphate is considered to restrict the induction of |
| A. | primary metabolites |
| B. | secondary metabolites |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» C. both (a) and (b) | |
| 60. |
Radioisotopes are frequently used in the study of cells. Assume a culture of E. coli is grown in a culture medium containing radioactive sulphur. At the end of 48 hours, it is expected to find the radioactive label located in |
| A. | DNA |
| B. | enzymes |
| C. | RNA |
| D. | all of these |
| Answer» C. RNA | |
| 61. |
Entner-Doudoroff pathway is found in |
| A. | aerobic prokaryotes |
| B. | anaerobic prokaryotes |
| C. | both (a) and (b) |
| D. | aerobic eukaryotes |
| Answer» D. aerobic eukaryotes | |
| 62. |
TCA cycle functions in |
| A. | catabolic reactions |
| B. | anabolic reactions |
| C. | amphibolic reactions |
| D. | none of these |
| Answer» D. none of these | |
| 63. |
In the passive diffusion, solute molecules cross the membrane as a result of |
| A. | concentration difference |
| B. | pressure difference |
| C. | ionic difference |
| D. | all of these |
| Answer» B. pressure difference | |
| 64. |
Dolichol phosphate is |
| A. | a complex lipid involved in docking vesicles with the plasma membrane |
| B. | the anchor on which sugars assemble before transfer to proteins |
| C. | a chaperone used in protein folding |
| D. | a product of phospholipase C activation |
| Answer» C. a chaperone used in protein folding | |
| 65. |
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 | |
| 66. |
Free energy change ( G) 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 | |
| 67. |
Which of the following nucleoside diphosphates is used most often in carbohydrate anabolism? |
| A. | Uridine diphosphate |
| B. | Adenosine diphosphate |
| C. | Guanine diphosphate |
| D. | Thymine diphosphate |
| Answer» B. Adenosine diphosphate | |
| 68. |
Incorporation of atmospheric N2to NH4+ occurs via the process of |
| A. | assimilatory nitrate reduction |
| B. | transamination |
| C. | deamination |
| D. | nitrogen fixation |
| Answer» E. | |
| 69. |
Phosphate regulation has been observed in the production of |
| A. | alkaloids |
| B. | antibiotics |
| C. | gibberelins |
| D. | all of these |
| Answer» E. | |
| 70. |
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 | |
| 71. |
When acetate is the sole source of carbon for some microorganisms, the cycle which is used, is called |
| A. | pentose phosphate pathway |
| B. | glycolyic pathway |
| C. | glyoxylate pathway |
| D. | oxaloacetate pathway |
| Answer» D. oxaloacetate pathway | |