MCQOPTIONS
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MCQOPTIONS
This section includes 199 Mcqs, each offering curated multiple-choice questions to sharpen your Life Sciences knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
How many possible orientations do spin 1/2 nuclei have when they are located in an applied magnetic field? |
| A. | 3 |
| B. | 2 |
| C. | 6 |
| D. | 4 |
| Answer» C. 6 | |
| 52. |
Which one of the following is not produced in any of the steps of glycolysis? |
| A. | NADH |
| B. | NAD |
| C. | ATP |
| D. | ADP |
| Answer» B. NAD | |
| 53. |
Cholesterolemia means |
| A. | lack of functional HDL receptor |
| B. | lack of functional LDL receptors |
| C. | none of the above |
| D. | high sensitivity to fatty food intake |
| Answer» C. none of the above | |
| 54. |
Types of exotoxin, most commonly associated with botulism in man, is/are? |
| A. | Type B |
| B. | Type A |
| C. | All of these |
| D. | Type E |
| Answer» D. Type E | |
| 55. |
Which of the following is not a mechanism for altering the flux of metabolites through the rate-determining step of a pathway? |
| A. | Diffusional coupling between adjacent active sites |
| B. | Allosteric control of the enzyme activity |
| C. | Covalent modification of the enzyme |
| D. | Genetic control of the enzyme concentration |
| Answer» B. Allosteric control of the enzyme activity | |
| 56. |
Which of the following compounds is responsible for coordinated regulation of glucose and glycogen metabolism? |
| A. | Fructose 2,6 bisphosphate |
| B. | NAD |
| C. | Fructose 1,6 bisphosphate |
| D. | Acetyl-CoA |
| Answer» B. NAD | |
| 57. |
The end products of noncyclic photophosphorylation are |
| A. | water, ADP and NADP |
| B. | O2, ATP and NADPH |
| C. | carbon dioxide, ATP and water |
| D. | carbon dioxide, PGAL (phosphoglyceraldehyde), and H2 |
| Answer» C. carbon dioxide, ATP and water | |
| 58. |
Thermus thermopiles is a |
| A. | gram positive eubacteria |
| B. | gram negative eubacteria |
| C. | gram positive archebacteria |
| D. | gram negative archebacteria |
| Answer» C. gram positive archebacteria | |
| 59. |
Generation time is |
| A. | time required for the initial adjustment |
| B. | time required for the population to double |
| C. | both ( and ( |
| D. | obtained by expression t/n, where t = time interval, n = number of generation |
| Answer» D. obtained by expression t/n, where t = time interval, n = number of generation | |
| 60. |
The bacteria deficient in cell wall is |
| A. | Mycoplasma |
| B. | Treponema |
| C. | Klebsiella |
| D. | Staphylococcus |
| Answer» B. Treponema | |
| 61. |
During the light-dependent reactions of photosynthesis, which of the following does not occur? |
| A. | Carbon dioxide fixation |
| B. | Splitting of water |
| C. | Absorption of light energy by photosystems |
| D. | Release of oxygen |
| Answer» B. Splitting of water | |
| 62. |
Lipoic acid is a co-factor of the |
| A. | α-ketoglutaric dehydrogenase |
| B. | pyruvic dehydrogenase |
| C. | di-hydroorotate dehydrogenase |
| D. | both ( and ( |
| Answer» E. | |
| 63. |
Nitrate reduction can be carried out by |
| A. | plant and microorganism |
| B. | only microorganism |
| C. | none of these |
| D. | only plants |
| Answer» B. only microorganism | |
| 64. |
The mineral which is considered important in maintaining electrical potential in nerves and membranes is |
| A. | manganese |
| B. | magnesium |
| C. | iron |
| D. | calcium |
| Answer» C. iron | |
| 65. |
Which of the following mediates Type I hypersensitivity reaction? |
| A. | IgG |
| B. | IgE |
| C. | IgD |
| D. | IgM |
| Answer» C. IgD | |
| 66. |
Where does the O2 come from that is essential for the proper functioning of oxidative phosphorylation? |
| A. | Light reactions of photosynthesis |
| B. | Fermentation |
| C. | Carbon fixation |
| D. | Dark reactions of photosynthesis |
| Answer» B. Fermentation | |
| 67. |
Which of the following vitamin is essential for the absorption of calcium from the intestinal tract? |
| A. | Vitamin E |
| B. | Vitamin D |
| C. | Vitamin B6 |
| D. | Vitamin B12 |
| Answer» C. Vitamin B6 | |
| 68. |
A kinase is an enzyme that |
| A. | uses ATP to add a phosphate group to the substrate |
| B. | removes phosphate groups of substrates |
| C. | removes water from a double bond |
| D. | uses NADH to change the oxidation state of the substrate |
| Answer» B. removes phosphate groups of substrates | |
| 69. |
Tyrosine is degraded to acetoacetyl CoA and fumarate and is described as a |
| A. | ketogenic amino acid |
| B. | glucogenic amino acid |
| C. | keto-gluco amino acid |
| D. | ketogenic and glucogenic amino acid |
| Answer» E. | |
| 70. |
When placed in a magnetic field, all the random spins of the nuclei |
| A. | reverse direction |
| B. | stop |
| C. | rotate to 90° away from the induced field |
| D. | align with the magnetic field |
| Answer» E. | |
| 71. |
Glycolytic pathway regulation involves |
| A. | allosteric inhibition by ATP |
| B. | allosteric stimulation by ADP |
| C. | all of the above |
| D. | feedback, or product, inhibition by ATP |
| Answer» D. feedback, or product, inhibition by ATP | |
| 72. |
PCR can be used to amplify a specific fragment of DNA from which of the following? |
| A. | A hair follicle |
| B. | A drop of blood |
| C. | All of these |
| D. | A fragment of skin |
| Answer» D. A fragment of skin | |
| 73. |
Additional mono saccharides are added in Golgi to produce |
| A. | either fructose type monosaccharide or a complex type |
| B. | either high mannose type oligosaccharide or a complex type |
| C. | none of the above |
| D. | either high sucrose type polysaccharide or a complex type |
| Answer» C. none of the above | |
| 74. |
FAD is reduced to FADH2 during |
| A. | lactate fermentation |
| B. | electron transport phosphorylation |
| C. | glycolysis |
| D. | Krebs cycle |
| Answer» E. | |
| 75. |
Phosphofructokinase, the major flux-controlling enzyme of glycolysis is allosterically inhibited and activated respectively by |
| A. | AMP and Pi |
| B. | ATP and PEP |
| C. | Citrate and ATP |
| D. | ATP and ADP |
| Answer» E. | |
| 76. |
In the co-enzyme B12the position occupied by a cyanide ion in vitamin B12 is bonded directly to the __________ of the ribose of adenosine. |
| A. | 5-6 dimethylbenzimidazole |
| B. | adenine |
| C. | cyanocobalamin |
| D. | hydroxycobalamin |
| Answer» C. cyanocobalamin | |
| 77. |
Where the acyl-CoA formed in the cytosol is transported for oxidation? |
| A. | Microsomes |
| B. | Mitochondrial matrix |
| C. | Remains in cytosol |
| D. | Endoplasmic reticulum |
| Answer» C. Remains in cytosol | |
| 78. |
Nutrient content and biological structures are considered as |
| A. | intrinsic factor for microbial growth |
| B. | implicit factor for microbial growth |
| C. | none of the above |
| D. | processing factor |
| Answer» B. implicit factor for microbial growth | |
| 79. |
Long-chain fatty acids are oxidized step-wise in one carbon units starting from the |
| A. | aliphatic end |
| B. | carboxyl end |
| C. | none of these |
| D. | both ( and ( |
| Answer» C. none of these | |
| 80. |
The ability of Vibrio fischeri to produce bioluminescence chemicals only when a certain population density has been reached is an example of |
| A. | Shelford's law of tolerance |
| B. | Liebig's law of the minimum |
| C. | Heisenberg's principle of uncertainty |
| D. | quorum sensing |
| Answer» E. | |
| 81. |
Why do fluorescence spectrometers often use double-beam optics? |
| A. | To compensate for beam attenuation by the monochromator |
| B. | So a reference solution can be used |
| C. | All of the above |
| D. | To compensate for power fluctuations in the radiation source |
| Answer» E. | |
| 82. |
Which of the following is commonly used as Gram\'s decolouriser? |
| A. | Methyl alcohol |
| B. | Ethyl alcohol |
| C. | A mixture of ethyl alcohol and acetone |
| D. | Acetone |
| Answer» D. Acetone | |
| 83. |
The column is heated to |
| A. | control elution of the different analytes |
| B. | prevent analyte condensation within the column |
| C. | all of these |
| D. | reduce band broadening to get sharper peaks |
| Answer» D. reduce band broadening to get sharper peaks | |
| 84. |
In the intersystem crossing |
| A. | a molecule converts its excess energy to light, and emits a photon |
| B. | the spin of an excited electron reverses, changing the state of the molecule (from singlet state to triplet state or vice vers |
| C. | all of the above |
| D. | a molecule converts excess electronic energy to vibrational energy |
| Answer» C. all of the above | |
| 85. |
At the center of the cell cycle control system is Cdk, a protein that |
| A. | binds to different cyclins |
| B. | is phosphorylated to become active |
| C. | manufactures growth factors |
| D. | is only active during mitosis |
| Answer» B. is phosphorylated to become active | |
| 86. |
Which of the following structure is present in prokaryotic cells? |
| A. | Chloroplasts |
| B. | Mitochondria |
| C. | Mesosome |
| D. | Golgi structure |
| Answer» D. Golgi structure | |
| 87. |
Porins are located in |
| A. | the peptidoglycan layer of gram-positive bacteria |
| B. | the outer membrane of gram-negative bacteria |
| C. | the periplasmic space of gram-negative bacteria |
| D. | the cytoplasmic membrane of both gram-negative and gram-positive bacteria |
| Answer» C. the periplasmic space of gram-negative bacteria | |
| 88. |
Archeal cells usually do not contain peptidoglycan, rather contain pseudo-peptidoglycan which is mainly composed of |
| A. | N-acetylmuramic acid and D-amino acids |
| B. | N-acetylmuramic acid and L-amino acids |
| C. | N-acetyltalosaminuronic acid and L-amino acids |
| D. | N-acetyltalosaminuronic acid and D-amino acids |
| Answer» D. N-acetyltalosaminuronic acid and D-amino acids | |
| 89. |
Cytoplasmic inclusions include |
| A. | mesosomes |
| B. | ribosomes |
| C. | all of these |
| D. | fat globules |
| Answer» D. fat globules | |
| 90. |
A common way that cells capture the energy released during the breakdown of large molecules is to add electrons to smaller, specialized molecules that can accept them. This process of electron acceptance is otherwise known as |
| A. | metabolism |
| B. | biosynthesis |
| C. | catalysis |
| D. | reduction |
| Answer» E. | |
| 91. |
Which were the investigators lived at the same time? |
| A. | Darwin and Woese |
| B. | Koch and Pasteur |
| C. | Berg and Hooke |
| D. | Van Leeuenhoek and Ricketts |
| Answer» C. Berg and Hooke | |
| 92. |
In the past, IR spectra had to be aquired one wavelength at a time, which took a long time. Today quick spectra is due to the |
| A. | light is faster today that it used to be |
| B. | the Fourier Transfer Algorithm allows us to scan all frequencies at once |
| C. | none of the above |
| D. | absence of broad spectrum of wavelenth |
| Answer» C. none of the above | |
| 93. |
Which one of the following is produced in the greatest numbers during one turn of the Krebs cycle? |
| A. | Acetyl-CoA |
| B. | NADH |
| C. | ATP |
| D. | FADH2 |
| Answer» C. ATP | |
| 94. |
Drumstick appearance is characteristic of |
| A. | C tetani |
| B. | C tetanomorphum |
| C. | all of these |
| D. | C sphenoides |
| Answer» D. C sphenoides | |
| 95. |
Which of the following lymphokine(s) is secreted by delayed-type-hypersensitivity cells? |
| A. | Migration inhibiting factor |
| B. | Macrophage stimulating factor |
| C. | All of the above |
| D. | Macrophage activating factor |
| Answer» D. Macrophage activating factor | |
| 96. |
Bacteria are |
| A. | symbiotic |
| B. | saprophytic |
| C. | all of these |
| D. | hyper parasitic |
| Answer» C. all of these | |
| 97. |
Which of these hormones is a catecholamine? |
| A. | Norepinephrine |
| B. | Follitropin |
| C. | Tetrahydrofolate |
| D. | Tetraiodothyronine |
| Answer» B. Follitropin | |
| 98. |
Which of the following types of Clostridium perfringens produces alpha toxin most abundantly? |
| A. | Type B |
| B. | Type A |
| C. | Type D |
| D. | Type C |
| Answer» C. Type D | |
| 99. |
A retention gap is placed between the injector and the front of the column to |
| A. | retain the sample and release it gradually to the column |
| B. | retain contaminants and prevent them from reaching the column |
| C. | all of the above |
| D. | prevent backflush of the injected solution |
| Answer» C. all of the above | |
| 100. |
The complete oxidation of glucose yields usable energy in the form of |
| A. | coenzyme A |
| B. | FADH2 |
| C. | pyruvic acid |
| D. | ATP |
| Answer» E. | |