MCQOPTIONS
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MCQOPTIONS
This section includes 165 Mcqs, each offering curated multiple-choice questions to sharpen your Microbiology knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
Which of the following species produces neurotoxin which causes death of aquatic animals? |
| A. | Chlorella |
| B. | Gonyaulax |
| C. | Prototheca |
| D. | Cephaleuros |
| Answer» C. Prototheca | |
| 102. |
Transmission of bubonic plague is by |
| A. | rat flea |
| B. | inhalation |
| C. | ingestion |
| D. | all of these |
| Answer» B. inhalation | |
| 103. |
Which of the following property(ies), shown by the organisms belong(s) to the family Enterobacteriaceae? |
| A. | They are catalase-positive |
| B. | They are oxidase-negative |
| C. | They ferment glucose |
| D. | All of these |
| Answer» E. | |
| 104. |
Which of the following best describes the algae known as diatoms? |
| A. | Cells have intricate shells of silicon dioxide with two halves |
| B. | Cells are encased in rigid walls composed of cellulose coated with silicon |
| C. | Cells have flagella and a light-detecting eye spot |
| D. | Cells contain carotenoid pigments as well as chlorophyll A and B |
| Answer» B. Cells are encased in rigid walls composed of cellulose coated with silicon | |
| 105. |
Bioluminescence is a phenomenon associated with |
| A. | chrysophyta |
| B. | phaeophyta |
| C. | pyrrophyta |
| D. | chlorophyta |
| Answer» D. chlorophyta | |
| 106. |
The bacteria that is negative for fermentation of mannitol is |
| A. | S flexneri |
| B. | S boydii |
| C. | S dysenteriae |
| D. | S sonnei |
| Answer» D. S sonnei | |
| 107. |
Which of the following genus belongs to family Spirochaetaceae? |
| A. | Treponema |
| B. | Spirochaeta |
| C. | Borrelia |
| D. | All of these |
| Answer» E. | |
| 108. |
Which of the following protozoa construct shells of silica? |
| A. | foraminiferans |
| B. | radiolarians |
| C. | heliozoida |
| D. | sporozoa |
| Answer» C. heliozoida | |
| 109. |
The most common cause of urinary tract infection in the community is |
| A. | Klebsiella pneumoniae |
| B. | Proteus vulgaris |
| C. | Escherichia coli |
| D. | Citrobacter freundii |
| Answer» D. Citrobacter freundii | |
| 110. |
Number of flagella produced by motile cells in |
| A. | members of the phaeophyta is greater than members of the Oomycota |
| B. | members of the Oomycota is greater than members of the Phaeophyta |
| C. | members of the Phaeophyta is approximately equal to members of the Oomycota |
| D. | none of the above |
| Answer» D. none of the above | |
| 111. |
Which of the following algal divisions is characterized by possession of chlorophylls A and B, starch as the energy storage material, cellulosic cell walls and live in freshwater and marine habitats? |
| A. | Chlorophyta |
| B. | Chrysophyta |
| C. | Phaeophyta |
| D. | Pyrrophyta |
| Answer» B. Chrysophyta | |
| 112. |
Which of the following serotypes of Salmonella can cause gastroenteritis? |
| A. | S enteritidis |
| B. | S newport |
| C. | S typhimurium |
| D. | All of these |
| Answer» E. | |
| 113. |
Algae are known as primary producers. |
| A. | True |
| B. | False |
| C. | May be |
| D. | Can't say |
| Answer» B. False | |
| 114. |
African sleeping sickness is caused by _________________ |
| A. | bacteria |
| B. | fungi |
| C. | protozoa |
| D. | viruses |
| Answer» D. viruses | |
| 115. |
Fucoxanthin pigment is present in _______________ |
| A. | Rhodophycophyta |
| B. | Xanthophycophyta |
| C. | Phaeophycophyta |
| D. | Chlorophycophyta |
| Answer» D. Chlorophycophyta | |
| 116. |
Chlorophyll d is present in the members of _____________________ |
| A. | Xanthophycophyta |
| B. | Phaeophycophyta |
| C. | Rhodophycophyta |
| D. | Chrysophycophyta |
| Answer» D. Chrysophycophyta | |
| 117. |
Phycoerythrin pigment is present in which algal division? |
| A. | Xanthophycophyta |
| B. | Rhodophycophyta |
| C. | Chrysophycophyta |
| D. | Phaeophycophyta |
| Answer» C. Chrysophycophyta | |
| 118. |
Chrysolaminarin is the reserved food of ___________________ |
| A. | Chlorophycophyta |
| B. | Phaeophycophyta |
| C. | Xanthophycophyta |
| D. | Bacillariophycophyta |
| Answer» D. Bacillariophycophyta | |
| 119. |
Chloroplasts of algae embedded in the midst of the cytoplasm is known as ________________ |
| A. | parietal |
| B. | asteroidal |
| C. | central |
| D. | peripheral |
| Answer» C. central | |
| 120. |
Two lateral flagella are present in which of the following groups of algae? |
| A. | Rhodophycophyta |
| B. | Xanthophycophyta |
| C. | Phaeophycophyta |
| D. | Bacillariophycophyta |
| Answer» D. Bacillariophycophyta | |
| 121. |
Carotenes are oxygenated derivatives of hydrocarbons. |
| A. | True |
| B. | False |
| C. | May be |
| D. | Can't say |
| Answer» C. May be | |
| 122. |
Which of the following are water-soluble pigments? |
| A. | chlorophyll |
| B. | biloproteins |
| C. | carotenoids |
| D. | fucoxanthin |
| Answer» C. carotenoids | |
| 123. |
Which of the following disease is caused by Yersinia enterocolitica in man? |
| A. | Gastroenteritis |
| B. | Mesenteric lymphadenitis |
| C. | Septicaemia |
| D. | All of these |
| Answer» E. | |
| 124. |
Which of the following can readily kill Salmonellae? |
| A. | Moist heat at 55°C for 20 min |
| B. | Moist heat at 55°C for 10 min |
| C. | Moist heat at 55°C for 30 min |
| D. | Moist heat at 55°C for 1 hr |
| Answer» E. | |
| 125. |
Leishmania donovani measures _____________ in length. |
| A. | 600 micrometre |
| B. | 1 to 4 micrometre |
| C. | 2 mm |
| D. | 2000 micrometre |
| Answer» C. 2 mm | |
| 126. |
Which of the following biochemical reaction is characteristic of Pseudomonas aeruginosa? |
| A. | Production of pyocyanin |
| B. | Oxidative utilization of glucose |
| C. | Oxidase production |
| D. | All of these |
| Answer» E. | |
| 127. |
Organisms which have spore-forming stage in their life cycle and lack special locomotory organelles belong to which phylum of Protozoa? |
| A. | Microspora |
| B. | Myxozoa |
| C. | Ciliophora |
| D. | Apicomplexa |
| Answer» E. | |
| 128. |
Enterobacter can be differentiated from Klebsiella by |
| A. | ornithine positivity |
| B. | motility |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» D. none of these | |
| 129. |
The Sporozoa belongs to which of the following phylum? |
| A. | Ciliophora |
| B. | Labyrinthomorpha |
| C. | Microspora |
| D. | Apicomplexa |
| Answer» E. | |
| 130. |
Most commonly asexual reproduction in the Protozoa is by |
| A. | conjugation |
| B. | gametangial contact |
| C. | binary fission |
| D. | binary fusion |
| Answer» D. binary fusion | |
| 131. |
pH range optimal for maximum metabolic activity of protozoa is ______________ |
| A. | 2-3 |
| B. | 12-14 |
| C. | 6-8 |
| D. | 4-6 |
| Answer» D. 4-6 | |
| 132. |
Saprozoic nutrition is characterized by |
| A. | phagocytosis of solid nutrients and subsequent formation of phagocytic vacuoles |
| B. | pinocytosis of solid nutrients and subsequent formation of phagocytic vacuoles |
| C. | encystment of solid nutrients and subsequent formation of secretory vacuoles |
| D. | pinocytosis of soluble nutrients and subsequent formation of phagocytic vacuoles |
| Answer» E. | |
| 133. |
Sereny test is used for the detection of |
| A. | enteropathogenic Escherichia coli |
| B. | enterotoxigenic E. coli |
| C. | enteroinvasive E. coli |
| D. | verotoxigenic E. coli |
| Answer» D. verotoxigenic E. coli | |
| 134. |
The number of flagella produced by motile cells in |
| A. | members of the Rhodophyta is greater than members of the Phaeophyta |
| B. | members of the Phaeophyta is greater than members of the Rhodophyta |
| C. | members of the Rhodophyta is exactly or approximately equal to members of the Phaeophyta |
| D. | none of the above |
| Answer» C. members of the Rhodophyta is exactly or approximately equal to members of the Phaeophyta | |
| 135. |
Sylvatic plague occurs in |
| A. | mice |
| B. | squirrels |
| C. | chipmunks |
| D. | all of these |
| Answer» E. | |
| 136. |
Heat-labile enterotoxin of Escherichia coli activates |
| A. | guanylate cyclase |
| B. | adenylate cyclase |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» C. both (a) and (b) | |
| 137. |
Golgi bodies are also known as __________________ |
| A. | dictyosomes |
| B. | kinetosomes |
| C. | blepharoplasts |
| D. | myonemes |
| Answer» B. kinetosomes | |
| 138. |
Which of the following are formed in pyrenoids? |
| A. | oil |
| B. | glucose |
| C. | starch |
| D. | silica |
| Answer» D. silica | |
| 139. |
Which of the following species are imporant for cervical dilation? |
| A. | Laminaria japonica |
| B. | Gracilaria |
| C. | Chondrus |
| D. | Gonyaulax catenella |
| Answer» B. Gracilaria | |
| 140. |
Long,slender bodies with an oval nucleus and capable of producing new infection are known as _________________ |
| A. | ookinetes |
| B. | sporozoites |
| C. | anisogametes |
| D. | spermatozoa |
| Answer» C. anisogametes | |
| 141. |
Plasmodium divides by which of the following method most commonly? |
| A. | Binary fission |
| B. | Multiple fission |
| C. | Budding |
| D. | Regeneration |
| Answer» C. Budding | |
| 142. |
In Yersinia pestis, capsule is best demonstrated in cultures grown at |
| A. | 25°C |
| B. | 29°C |
| C. | 37°C |
| D. | 45°C |
| Answer» D. 45°C | |
| 143. |
The agent(s) which can cause plague is/are |
| A. | Yersinia pestis |
| B. | Proteus mirabilis |
| C. | Pseudomonas aeruginosa |
| D. | All of these |
| Answer» B. Proteus mirabilis | |
| 144. |
Which algal division never produces motile, flagellated cells among any of its members? |
| A. | Chlorophyta |
| B. | Chrysophyta |
| C. | Phaeophyta |
| D. | Rhodophyta |
| Answer» E. | |
| 145. |
Traveller's diarrhea is caused by |
| A. | enteropathogenic Escherichia coli (EPEC) |
| B. | entero invasive E. coli (EIEC) |
| C. | entero toxigenic E. coli (ETEC) |
| D. | entero haemorrhagic E. coli (EHEC) |
| Answer» D. entero haemorrhagic E. coli (EHEC) | |
| 146. |
The bacteria which produce(s) β-galactosidase is/are |
| A. | Citrobacter |
| B. | Enterohacter |
| C. | Serratia |
| D. | all of these |
| Answer» E. | |
| 147. |
Salmonellae can also be killed by |
| A. | pasteurisation |
| B. | chlorination |
| C. | boiling |
| D. | all of these |
| Answer» E. | |
| 148. |
Gullet is present in which algae? |
| A. | Euglenoids |
| B. | Golden algae |
| C. | Dinoflagellates |
| D. | Green algae |
| Answer» B. Golden algae | |
| 149. |
Algae is a nonvalid taxinomic term that refers to |
| A. | eukaryotic organisms that have chlorophyll a and produce O2 |
| B. | well developed cellular structure including a conducting system |
| C. | Both (a) and (b) |
| D. | none of the above |
| Answer» B. well developed cellular structure including a conducting system | |
| 150. |
African sleeping sickness is transmitted by which of the following agents? |
| A. | biting insects |
| B. | sexual means |
| C. | tsetse fly |
| D. | bloodsucking insects |
| Answer» D. bloodsucking insects | |