Microbiology PYQs – Set 60

By Atul Sahu • Microbiology, Subject Wise PYQs

Microbiology PYQs – Set 60

Subject : Microbiology

1181. Assertion: Gram-negative bacteria fail to retain the primary stain (crystal violet). Reason: Their LPS-rich outer membrane prevents stain retention. Choose:

Microbiology • Bacterial Staining Techniques • GPAT 2021

A. Both (A) and (R) are true and (R) is the correct explanation of (A) B. Both (A) and (R) are true but (R) is NOT the correct explanation of (A) C. (A) is true but (R) is not false D. (A) is false but (R) is true

1182. Assertion: Gram-negative bacteria fail to retain crystal violet. Reason: LPS-rich membrane prevents stain retention. Choose:

Microbiology • Bacterial Staining Techniques • GPAT 2021

A. Both (A) and (R) true; (R) explains (A) B. Both (A) and (R) true; (R) does not explain (A) C. (A) true but (R) false D. (A) false but (R) true

1183. Which of the following pairs is mismatched?

Microbiology • Bacteriology • GPAT 2021

A. Aerobic, helical bacteria – gram negative B. Enterics – gram negative C. Mycobacteria – acid fast D. Pseudomonas – gram positive

1184. Several different chemicals released by microbes and inflamed tissues attract phagocytes, this phenomenon is called as __________.

Microbiology • Chemotaxis mechanisms • GPAT 2021

A. Phagocytosis B. Integrins C. Chemotaxis D. Emigration

1185. Which statements about organism classification are true?

Microbiology • Classification of Microorganisms • GPAT 2021

A. Bacteria under Monera; Protista are unicellular; Fungi include yeasts and molds B. Protista are eukaryotic and unicellular; Fungi include yeasts and molds; higher fungi are animals C. Bacteria under Monera; Protista are unicellular; yeasts/molds are Fungi D. Only yeasts and molds are Fungi

1186. The following grampositive bacteria is positive for the coagulase test:

Microbiology • Coagulase test • GPAT 2021

A. S. epidermidis B. S. aureus C. S. saprophyticus D. S. lactis

1187. Which eye infection is also called ‘Pink Eye’ infection?

Microbiology • Complete Subject • GPAT 2021

A. Fungal keratitis B. Viral keratitis C. Conjunctivitis D. Myopia

1188. Bacillus subtilis is used in the assay of which antibiotic?

Microbiology • Complete Subject • GPAT 2021

A. Penicillin B. Cephalosporin C. Vancomycin D. Streptomycin

1189. Which of the following is most likely to undergo lysis?

Microbiology • Complete Subject • GPAT 2021

A. A cell losing water from its cytoplasm B. A cell with intact, multilayer peptidoglycan cell wall C. A cell with disturbed pentaglycine bridges in its cell wall D. A cell with a hydrophilic outermost layer in its cell wall

1190. Which microorganism is involved in the assay of Rifampicin?

Microbiology • Complete Subject • GPAT 2021

A. Bacillus subtilis B. Micrococcus luteus C. Bacillus pumilus D. Bacillus cereus

1191. Which of the following statements is correct for gram positive bacteria?

Microbiology • Complete Subject • GPAT 2021

A. Cell wall has a thin peptidoglycan layer B. Cell wall lipid content is very low and smaller periplasmic space C. Lipopolysaccharide layer is present D. Teichoic acid is present

1192. A gram-negative diplococcus associated with urinary tract infection, pelvic inflammatory disease, conjunctivitis, and meningitis is

Microbiology • Complete Subject • GPAT 2021

A. Neisseria gonorrhoeae B. Chlamydia trachomatis C. Haemophilus influenzae D. Streptococcus pneumoniae

1193. The resistance to macrolide antibiotics by gram-positive organisms is developed due to

Microbiology • Complete Subject • GPAT 2021

A. Decreased uptake of antibiotics B. Synthesis of an esterase enzyme that hydrolyzes the lactone ring C. Methylation of the 50S subunit at the antibiotic binding site D. Increased metabolism of the antibiotic

1194. All of the following are gram-negative rods EXCEPT

Microbiology • Complete Subject • GPAT 2021

A. Clostridium B. Escherichia C. Salmonella D. Shigella

1195. Herpesviruses examples EXCEPT

Microbiology • Complete Subject • GPAT 2021

A. Epstein-Barr Virus B. Herpes simplex C. Varicella Zoster D. NONE

1196. Which of the following statements is NOT TRUE about prokaryotes?

Microbiology • Complete Subject • GPAT 2021

A. Nucleus is not bounded by a nuclear membrane B. Cell wall contains peptidoglycan C. 80S ribosomes are distributed in cytoplasm D. It is haploid in nature

1197. Which of the following are obligatory intracellular parasites? (P) Virus, (Q) Fungus, (R) Mycobacterium, (S) Rickettsia

Microbiology • Complete Subject • GPAT 2021

A. All B. (P), (Q) and (R) C. (R) and (S) D. (P) and (S)

1198. The time taken at a fixed temperature or the radiation dose required to achieve a 90% reduction in viable bacterial cells is called:

Microbiology • Complete Subject • GPAT 2021

A. F value B. Z value C. D value D. T value

1199. Match the process of reproduction and genetic exchange under column I with the explanation under column II: A. Binary fission B. Transformation C. Transduction D : Conjugation. Choose the correct matching.

Microbiology • Complete Subject • GPAT 2021

A. A–I, B–III, C–IV, D–II B. A–III, B–I, C–IV, D–II C. A–II, B–IV, C–I, D–III D. A–II, B–IV, C–III, D–I

1200. Exotoxins diffuse freely through the bacterial cell wall into the medium in which organisms are growing. They are water‑soluble and pass into the surrounding medium. Choose the correct combination of Assertion and Reason:

Microbiology • Complete Subject • GPAT 2021

A. Both statements are true, and the reason is the correct explanation B. Both statements are true, but the reason is not the correct explanation C. Assertion is true, reason is false D. Assertion is false, reason is true

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