MCQOPTIONS
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MCQOPTIONS
This section includes 533 Mcqs, each offering curated multiple-choice questions to sharpen your Dairy Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
The period between inoculation of bacteria in a culture medium and beginning of multiplication is known as |
| A. | stationary phase |
| B. | log phase |
| C. | lag phase |
| D. | decline phase |
| Answer» D. decline phase | |
| 202. |
Which of the following properties is due to lysogenic conversion by phages? |
| A. | Toxin production in Corynebacterium diphtheriae |
| B. | Toxin production in Clostridium botulinum types C and D |
| C. | Antigenic variation in Salmonella anatum |
| D. | All of the above |
| Answer» E. | |
| 203. |
What is the colour of gram-negative bacteria on a gram staining? |
| A. | Purple |
| B. | Pink |
| C. | Green |
| D. | Colourless |
| Answer» C. Green | |
| 204. |
The filamentous bacteriopohage infect male E. coli cells by attaching to |
| A. | lipopolysaccharide |
| B. | the cell wall |
| C. | the tip of the pilus |
| D. | the cell membrane |
| Answer» D. the cell membrane | |
| 205. |
'Clostridium tetani' is an example of |
| A. | Facultative aerobes |
| B. | Obligate aerobes |
| C. | Obligate anaerobes |
| D. | Aerobes |
| Answer» D. Aerobes | |
| 206. |
Streptolysin O is |
| A. | antigenic |
| B. | oxygen-labile |
| C. | heat-labile |
| D. | all of these |
| Answer» E. | |
| 207. |
The genus/genera that belongs to the family Micrococcaceae is |
| A. | Micrococcus |
| B. | Staphylococcus |
| C. | Planococcus |
| D. | All of these |
| Answer» E. | |
| 208. |
Which of the following bacterial colonies fluoresce brick-red in UV light? |
| A. | B gingivalis |
| B. | B melaninogenicus |
| C. | Bacteroides fragilis |
| D. | B levii |
| Answer» C. Bacteroides fragilis | |
| 209. |
Which of the following genera is included in the family Bacteroi-daceae? |
| A. | Bacteroides |
| B. | Fusobacterium |
| C. | Leptotrichia |
| D. | All of these |
| Answer» E. | |
| 210. |
Bacteria and fungi multiply best |
| A. | below 16°C |
| B. | between 16-38°C |
| C. | above 38°C |
| D. | none of these |
| Answer» C. above 38°C | |
| 211. |
Which of the following is/are synthesized from late mRNA? |
| A. | Phage structural proteins |
| B. | Proteins that help with phage assembly without becoming part of the virion structure |
| C. | Proteins involved in cell lysis and phage release |
| D. | All of the above |
| Answer» E. | |
| 212. |
The gram-negative organisms is |
| A. | Actinomyces |
| B. | Bacillus |
| C. | Clostridium |
| D. | None of these |
| Answer» E. | |
| 213. |
Antimicrobial constituents for the microbial growth in foods are |
| A. | intrinsic factor |
| B. | extrinsic factor |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» B. extrinsic factor | |
| 214. |
Which of the following genus of organisms causes meningitis in adults? |
| A. | Erysipelothrix |
| B. | Listeria |
| C. | Caryophanon |
| D. | Brocothrix |
| Answer» C. Caryophanon | |
| 215. |
Which of the following causes “milky disease” of Japanese beetle grubs? |
| A. | B.thuringiensis |
| B. | B.popilliae |
| C. | B.sphaericus |
| D. | B.anthracis |
| Answer» C. B.sphaericus | |
| 216. |
Enterobacter sp. gives negative result for Voges-Proskauer test. |
| A. | True |
| B. | False |
| C. | May be |
| D. | Can't say |
| Answer» C. May be | |
| 217. |
Which of the following is the causative agent of plague? |
| A. | Y.enterocolitica |
| B. | Y.pestis |
| C. | P.mirabilis |
| D. | E.coli |
| Answer» C. P.mirabilis | |
| 218. |
Which of the following organism causes whooping cough in humans? |
| A. | E.coli |
| B. | Bordetella pertussis |
| C. | Francisella tularensis |
| D. | F.meningosepticum |
| Answer» C. Francisella tularensis | |
| 219. |
The cell diameter of bacteria belonging to family Enterobacteriaceae is ____________ |
| A. | 1 m |
| B. | 1 cm |
| C. | .3-1.5 micrometre |
| D. | 5 micrometre |
| Answer» D. 5 micrometre | |
| 220. |
What is the cell shape of the organisms belonging to the family Enterobacteriaceae? |
| A. | vibrio |
| B. | coccus |
| C. | bacillus |
| D. | straight rod |
| Answer» E. | |
| 221. |
Methylococcus and Methylomonas are all _______________ methane-oxidizers. |
| A. | aerobic |
| B. | facultative |
| C. | obligate |
| D. | anaerobic |
| Answer» D. anaerobic | |
| 222. |
Which of the following family of bacteria fix nitrogen under aerobic conditions? |
| A. | Pseudomonadaceae |
| B. | Azotobacteraceae |
| C. | Rhizobiaceae |
| D. | Methylcoccaceae |
| Answer» C. Rhizobiaceae | |
| 223. |
Agrobacterium also fixes atmospheric nitrogen. |
| A. | True |
| B. | False |
| C. | May be |
| D. | Can't say |
| Answer» C. May be | |
| 224. |
What is the color of the pigment xanthomonadin? |
| A. | Blue |
| B. | Yellow |
| C. | Fluorescent |
| D. | Red |
| Answer» C. Fluorescent | |
| 225. |
Which group of bacteria among the following give a positive reaction by the oxidase test? |
| A. | Spirochetes |
| B. | Aerobic/Microaerophilic, Motile,Helical/Vibroid,Gram-negative bacteria |
| C. | Non-motile,Gram-negative, Curved bacteria |
| D. | Aerobic,Gram-negative rods and cocci |
| Answer» C. Non-motile,Gram-negative, Curved bacteria | |
| 226. |
Pyocyanin, a blue water-soluble pigment is produced by which of the following pseudomonads? |
| A. | P.mallei |
| B. | P.syringae |
| C. | P.fluorescens |
| D. | P.aeruginosa |
| Answer» E. | |
| 227. |
Which of the following are important plant pathogens? |
| A. | P. aeruginosa |
| B. | P.maltophilia |
| C. | P.syringae |
| D. | P.pseudomallei |
| Answer» D. P.pseudomallei | |
| 228. |
Pseudomonas maltophilia is a fluorescent species. |
| A. | True |
| B. | False |
| C. | May be |
| D. | Can't say |
| Answer» C. May be | |
| 229. |
Pseudomonas bacteria uses which of the following as an electron acceptor for anaerobic respiration? |
| A. | Oxygen |
| B. | Nitrate |
| C. | Phosphate |
| D. | Sulphate |
| Answer» C. Phosphate | |
| 230. |
Streptococcus pyogenes can be differentiated from other haemolytic Streptococci on the basis of |
| A. | Bacitracin sensitivity |
| B. | Erythromycin sensitivity |
| C. | Aminoglycosides sensitivity |
| D. | Penicillin sensitivity |
| Answer» B. Erythromycin sensitivity | |
| 231. |
Food most often associated with emetic type of food poisoning caused by Bacillus cereus, is |
| A. | Meat |
| B. | Rice |
| C. | Milk |
| D. | Eggs |
| Answer» C. Milk | |
| 232. |
The most common cause of cystitis (after Escherichia coli) in healthy sexually active women is |
| A. | Staphylococcus saprophyticus |
| B. | Proteus mirabilis |
| C. | Pseudomonas aeruginosa |
| D. | Klebsiella pneumoniae |
| Answer» B. Proteus mirabilis | |
| 233. |
Quantitative measurement of bacterial growth can be carried out by measuring |
| A. | cell count |
| B. | cell mass |
| C. | cell activity |
| D. | all of these |
| Answer» E. | |
| 234. |
Stormy clot reaction is useful in identification of |
| A. | C tetani |
| B. | C botulinum |
| C. | C perfringens |
| D. | C difficile |
| Answer» D. C difficile | |
| 235. |
Bacillus species cannot fix Nitrogen. |
| A. | True |
| B. | False |
| C. | May be |
| D. | Can't say |
| Answer» C. May be | |
| 236. |
The ability of Vibrio fischeri to produce bioluminescence chemicals only when a certain population density has been reached is an example of |
| A. | Liebig's law of the minimum |
| B. | Shelford's law of tolerance |
| C. | quorum sensing |
| D. | Heisenberg's principle of uncertainty |
| Answer» D. Heisenberg's principle of uncertainty | |
| 237. |
The equation used to obtain bacterial population by binary fission is |
| A. | N = No2n |
| B. | log N/No = (0.3010) n |
| C. | log(N/No) = nlog 2 |
| D. | All of these |
| Answer» E. | |
| 238. |
Mycoplasmas cannot give rise to walled bacterial form like L-phase variants. |
| A. | True |
| B. | False |
| C. | May be |
| D. | Can't say |
| Answer» B. False | |
| 239. |
Which of the following genus of bacteria under the family Enterobacteriaceae is mainly associated with plants? |
| A. | Erwinia |
| B. | Serratia |
| C. | Proteus |
| D. | Yersinia |
| Answer» B. Serratia | |
| 240. |
Bacteria which produces coagulase is |
| A. | S epidermidis |
| B. | S saprophyticus |
| C. | S aureus |
| D. | S hominis |
| Answer» D. S hominis | |
| 241. |
Which of the following causes diarrhea in humans? |
| A. | A.lipoferum |
| B. | L.interrogans |
| C. | C.jejuni |
| D. | E.coli |
| Answer» D. E.coli | |
| 242. |
Which of the following bacteria causes syphilis in humans? |
| A. | Treponema dysenteriae |
| B. | Treponema pallidum |
| C. | Leptospira biflexa |
| D. | Leptospira interrogans |
| Answer» C. Leptospira biflexa | |
| 243. |
Which of the following have bipolar tufts of flagella? |
| A. | Aquaspirillum |
| B. | Azospirillum |
| C. | Cristispira |
| D. | Borrelia |
| Answer» B. Azospirillum | |
| 244. |
Which among the following are microaerophilic bacteria? |
| A. | Spirochaeta |
| B. | Cristispira |
| C. | Treponema |
| D. | Borrelia |
| Answer» E. | |
| 245. |
C.burnetti causes which of the following diseases? |
| A. | Q fever |
| B. | Trench fever |
| C. | Rocky Mountain spotted fever |
| D. | Typhoid |
| Answer» B. Trench fever | |
| 246. |
"Growing epicellularly" means _______________________ |
| A. | on the surface of host cells |
| B. | within the host cell |
| C. | engulfing the host cell |
| D. | damaging the cell membrane of host cell |
| Answer» B. within the host cell | |
| 247. |
Biting flies occur in which of the following place? |
| A. | Australia |
| B. | North America |
| C. | South America |
| D. | Africa |
| Answer» D. Africa | |
| 248. |
Which of the following genus of Rickettsiaceae have a high resistance to heat? |
| A. | Rickettsia |
| B. | Rochalimaea |
| C. | Coxiella |
| D. | Wolinella |
| Answer» D. Wolinella | |
| 249. |
Cytoplasm of bacteria contains smaller rings of DNA (Deoxyribonucleic Acid) known as |
| A. | chromatins |
| B. | chromatids |
| C. | plasmids |
| D. | pyramids |
| Answer» D. pyramids | |
| 250. |
Initial body in reproduction of Chlamydias is larger than the elementary body. |
| A. | True |
| B. | False |
| C. | May be |
| D. | Can't say |
| Answer» B. False | |