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.
| 101. |
Which of the following(s) is/ are oxidase-positive bacteria? |
| A. | Neisseria |
| B. | Vibrio |
| C. | All of these |
| D. | Pseudomonas |
| Answer» D. Pseudomonas | |
| 102. |
Which of the following is/are not a gram-positive bacteria? |
| A. | Pseudomonas |
| B. | Streptococci |
| C. | None of these |
| D. | Mycobacteria |
| Answer» B. Streptococci | |
| 103. |
VLDLs are synthesized in |
| A. | liver |
| B. | blood |
| C. | pancreas |
| D. | intestine |
| Answer» B. blood | |
| 104. |
Entner-Doudoroff pathway is found in |
| A. | anaerobic prokaryotes |
| B. | aerobic prokaryotes |
| C. | aerobic eukaryotes |
| D. | both ( and ( |
| Answer» E. | |
| 105. |
The cell mass can be measured optically by determining the amount of light scattered by a suspension of cells. The measurements are usually at a wavelength of |
| A. | 400-500nm |
| B. | 300-400nm |
| C. | 600-700nm |
| D. | 500-600nm |
| Answer» D. 500-600nm | |
| 106. |
The Archaea include all of the following except |
| A. | halophiles |
| B. | methanogens |
| C. | cyanobacteria |
| D. | thermoacidophiles |
| Answer» D. thermoacidophiles | |
| 107. |
Which of the following is the best described glucogenic amino acid? |
| A. | Tryptophan |
| B. | Lysine |
| C. | None of these |
| D. | Valine |
| Answer» E. | |
| 108. |
What is the relationship between wavelength and wave number? |
| A. | Wavenumber - wavelength in nanometers = 1 |
| B. | Wavenumber = 1 / wavelength in centimeters |
| C. | None of the above |
| D. | Wavelength in nanometers x wavenumber = 1 |
| Answer» C. None of the above | |
| 109. |
In cellular metabolism, O2 is used |
| A. | in glycolysis |
| B. | to provide electrons for photophosphorylation |
| C. | in the Krebs cycle |
| D. | as a terminal electron acceptor |
| Answer» E. | |
| 110. |
HPLC stands for |
| A. | High Performance Liquid Chromatography |
| B. | High Pressure Liquid Chromatography |
| C. | Highly Placed Liquid Chromatography |
| D. | both ( and ( |
| Answer» E. | |
| 111. |
The term homologous chromosomes |
| A. | is another name for sister chromatids |
| B. | refers to replications of the same chromosome |
| C. | means a pair of chromosomes of the same kind, such as sex chromosomes |
| D. | must be haploid |
| Answer» D. must be haploid | |
| 112. |
The whole-genome shotgun sequencing approach depends primarily on |
| A. | methodical sequencing a few large cloned fragments of DNA |
| B. | rapidly sequencing thousands of small randomly cloned fragments |
| C. | all of the above |
| D. | sequencing the bacterial chromosome while it is still intact |
| Answer» C. all of the above | |
| 113. |
All the following are basic properties of cells except |
| A. | cells have a genetic programme and the means to use it |
| B. | cells have nuclei and mitochondria |
| C. | cells are able to respond to stimuli |
| D. | cells are capable of producing more of themselves |
| Answer» C. cells are able to respond to stimuli | |
| 114. |
Blackening of meat in cooked meat broth is through |
| A. | C perfringens |
| B. | C histolyticum |
| C. | all of these |
| D. | C tetani |
| Answer» C. all of these | |
| 115. |
Many enzymes consists of a protein combined with low molecular weight organic molecule called as |
| A. | co-enzyme |
| B. | apoenzyme |
| C. | co-factors |
| D. | holoenzyme |
| Answer» B. apoenzyme | |
| 116. |
During exponential growth, the growth rate is |
| A. | reciprocal of generation time |
| B. | number of generations per unit time |
| C. | none of these |
| D. | both ( and ( |
| Answer» B. number of generations per unit time | |
| 117. |
Cytochrome C has an isoelectric pH of |
| A. | 10.05 |
| B. | 8.5 |
| C. | 11.05 |
| D. | 7.5 |
| Answer» B. 8.5 | |
| 118. |
Intracellular enzymes |
| A. | synthesize cellular material and perform catabolic reaction |
| B. | synthesize cellular material only |
| C. | only provide energy to the cell |
| D. | synthesize cellular material and perform anabolic reaction |
| Answer» B. synthesize cellular material only | |
| 119. |
A synergistic effect is observed when |
| A. | one organism produces a growth factor utilized by another |
| B. | one organism removes an inhibitory substance for another |
| C. | all of the above |
| D. | microbial alteration of pH, aw, Eh favours the growth of another |
| Answer» D. microbial alteration of pH, aw, Eh favours the growth of another | |
| 120. |
In eukaryotes fatty acid breakdown occurs in |
| A. | cytosol |
| B. | mitochondrial matrix |
| C. | endoplasmic reticulum |
| D. | cell membrane |
| Answer» C. endoplasmic reticulum | |
| 121. |
The common word for bacteria which are straight rod in shape is |
| A. | bacilli |
| B. | cooci |
| C. | pleomorphic |
| D. | spirilla |
| Answer» B. cooci | |
| 122. |
For the selection of lactobacilli present in cheddar cheese, the pH of the medium is maintained at |
| A. | 5.35 |
| B. | 6.35 |
| C. | 5.75 |
| D. | 4.35 |
| Answer» B. 6.35 | |
| 123. |
During the carboxylation phase of the Calvin cycle, CO2 combines with |
| A. | phosphoglyceraldehyde |
| B. | ribulose 1,5 - bisphosphate |
| C. | oxaloacetic acid |
| D. | pyruvic acid |
| Answer» C. oxaloacetic acid | |
| 124. |
The G0 phase is |
| A. | the state of most cells in an animal body |
| B. | a permanent state of all body cells |
| C. | all of the above |
| D. | another name for interphase |
| Answer» B. a permanent state of all body cells | |
| 125. |
E.coli ACP has its molecular weight as around |
| A. | 19000 |
| B. | 9000 |
| C. | 90000 |
| D. | 39000 |
| Answer» E. | |
| 126. |
Which of the following ion is required for the development of sound teeth with resistance to tooth decay? |
| A. | Sodium ion |
| B. | Fluoride ion |
| C. | Magnesium ion |
| D. | Chloride ion |
| Answer» C. Magnesium ion | |
| 127. |
What was the first eukaryotic chromosome to be sequenced? |
| A. | Yeast chromosome XI |
| B. | Yeast chromosome III |
| C. | None of these |
| D. | Arabidopsis chromosome IV |
| Answer» C. None of these | |
| 128. |
Micelles of fatty acids in water are organized such that the __________ faces the solvent and the __________ are directed toward the interior |
| A. | hydrophilic heads, hydrophobic tails |
| B. | carboxylic acid groups, hydrocarbon chains heads |
| C. | both ( and ( |
| D. | hydrocarbon chains, carboxylic acid groups |
| Answer» D. hydrocarbon chains, carboxylic acid groups | |
| 129. |
The process of Gram staining is based on the ability of bacterial cell wall |
| A. | to retain the crystal violet dye during solvent treatment. |
| B. | to retain the safranin dye |
| C. | none of above |
| D. | to retain part of both dyes |
| Answer» B. to retain the safranin dye | |
| 130. |
Which of the following structures or processes are logically associated with chloroplasts? |
| A. | Chlorophyll |
| B. | Plant cells |
| C. | All of these |
| D. | Thylakoid membranes |
| Answer» D. Thylakoid membranes | |
| 131. |
Southern blotting involves |
| A. | electrophoresis of DNA molecules and then blotting the separated RNA bands followed by incubation |
| B. | electrophoresis of DNA molecules and then blotting the separated DNA bands followed by incubation |
| C. | electrophoresis of RNA molecules and then blotting the separated RNA bands followed by incubation |
| D. | electrophoresis of DNA molecules followed by incubation |
| Answer» C. electrophoresis of RNA molecules and then blotting the separated RNA bands followed by incubation | |
| 132. |
Which of the following regulates glycolysis steps? |
| A. | Hexose kinase |
| B. | Phosphofructokinase |
| C. | All of these |
| D. | Pyruvate kinase |
| Answer» D. Pyruvate kinase | |
| 133. |
A nonsense mutation may result into |
| A. | a large deletion within the reading frame of a gene |
| B. | an abnormal elongation of a polypeptide |
| C. | modification of mRNA |
| D. | a premature termination of the synthesis of a polypeptide |
| Answer» E. | |
| 134. |
Why must the voltage supplied to a tungsten lamp be very stable? |
| A. | Because amount of energy the lamp emits is proportional to the fourth power of the operating voltage |
| B. | Because if it wasn't, the lamp would bum out |
| C. | All of the above |
| D. | Because the lamp will only function at a specific voltage |
| Answer» B. Because if it wasn't, the lamp would bum out | |
| 135. |
Peptone water and nutrient broth are |
| A. | enriched media |
| B. | selective media |
| C. | none of these |
| D. | basal media |
| Answer» E. | |
| 136. |
Periplasm is |
| A. | the area between the inner and outer membranes of Gram-positive bacteria |
| B. | the area between the inner and outer membranes of gram-negative bacteria |
| C. | the area outside the cell membrane that is influenced by the polymers |
| D. | the interior portion of mitochondria |
| Answer» C. the area outside the cell membrane that is influenced by the polymers | |
| 137. |
The mineral which aids in the utilization of iron and in hemoglobin synthesis is |
| A. | phosphorus |
| B. | calcium |
| C. | copper |
| D. | cobalt |
| Answer» D. cobalt | |
| 138. |
Pseudomonas pseudoflava can grow as |
| A. | chemo-organotrophs |
| B. | chemo-lithotrophs |
| C. | none of these |
| D. | both ( and ( |
| Answer» E. | |
| 139. |
The spindle forms in the |
| A. | G2 phase |
| B. | G1 phase |
| C. | S phase |
| D. | M phase |
| Answer» E. | |
| 140. |
Which of the following triggers the division of activated T lymphocytes? |
| A. | Interlukin 2 |
| B. | FGF |
| C. | Erythroprotein |
| D. | PDGF |
| Answer» B. FGF | |
| 141. |
Fluorescent treponemal antibody test is an example of |
| A. | direct immunofluorescence |
| B. | indirect immunofluorescence |
| C. | none of these |
| D. | both ( and ( |
| Answer» C. none of these | |
| 142. |
The number of ATP molecules produced from one glucose molecule by a bacterium producing lactic acid is |
| A. | lesser than producing ethanol |
| B. | greater than producing ethanol |
| C. | none of these |
| D. | approximately equal to producing ethanol |
| Answer» E. | |
| 143. |
How many oxygen molecules are required in the fermentation of one molecule of glucose to ethanol and CO2? |
| A. | 1 |
| B. | 0 |
| C. | 36 |
| D. | 2 |
| Answer» C. 36 | |
| 144. |
Eukaryotic cell organelles first emerged |
| A. | when prokaryotes engulfed each other and became interdependent |
| B. | from a specialized lineage of cells within the kingdom Protista |
| C. | just before the origin of the animal and fungal kingdoms |
| D. | when bacteria made their first attempts at reproduction |
| Answer» B. from a specialized lineage of cells within the kingdom Protista | |
| 145. |
The replication of chromosomes by eukaryotes occurs in a relatively short period of time because |
| A. | the eukaryotic replication machinery is 1000 times faster than the prokaryotes |
| B. | the eukaryotes have more amount of DNA for replication |
| C. | eukaryotic DNA is always single stranded |
| D. | each chromosome contains multiple replicons |
| Answer» E. | |
| 146. |
Which of the following species of Clostridium is predominantly sacchrolytic? |
| A. | C perfringens |
| B. | C septicum |
| C. | All of these |
| D. | C novyi |
| Answer» D. C novyi | |
| 147. |
Callus cultures are amorphous cell aggregates arising from the unorganized growth of explants on an |
| A. | solid nutrient medium |
| B. | liquid medium |
| C. | solid or liquid medium |
| D. | aseptic solid nutrient medium |
| Answer» E. | |
| 148. |
Which of the following may account for the small size of the cells? |
| A. | The surface area/volume ratio |
| B. | The rate of diffusion |
| C. | All of the above |
| D. | The number of mRNAs that can be produced by the nucleus |
| Answer» D. The number of mRNAs that can be produced by the nucleus | |
| 149. |
ATP is from which general category of molecules? |
| A. | Proteins |
| B. | Polysaccharides |
| C. | Amino acids |
| D. | Nucleotides |
| Answer» E. | |
| 150. |
In oxygenic photosynthesis, the electron donor is |
| A. | oxygen |
| B. | water |
| C. | NADPH |
| D. | NADH |
| Answer» C. NADPH | |