Microbiology MCQs Archives

271. Viruses can be isolated from clinical samples by cultivation in the following except_______________?

A. Tissue culture

B. Embryonated eggs

C. Animals

D. Chemically defined media

✅ The correct answer is option Chemically defined media.

272. Which of the following is NOT a live attenuated vaccine ?

A. Tuberculosis (BCG)

B. Typhoid

C. Varicella Zoster virus

D. Cholera

✅ The correct answer is option Cholera.

273. Interferon interferes with replication of virus at the time of_____________?

A. Protein synthesis

B. DNA/RNA replication

C. When virus enters the cell

D. Uncoating of the virus proteins capsule

✅ The correct answer is option Protein synthesis.

274. Diphtheria is pathogenic only when infected with______________?

A. Beta phage

B. Alfa phage

C. Lambda K12

D. Delta Phage

✅ The correct answer is option Beta phage.

275. For uniform staining reaction, morphology and biochemical activity it is advisable to study bacterial cultures during the_____________?

A. Lag phase

B. Death phase

C. Stationary phase

D. Logarithmic phase

✅ The correct answer is option Logarithmic phase.

276. EBV causes all except_________________?

A. Carcinoma of nasopharynx

B. Papilloma

C. Infectious mononucleosis

D. Burkitt’s lymphoma

✅ The correct answer is option Papilloma.

277. All are true about Entamoeba histolytica except________________?

A. Cysts are 8 nucleated

B. Cysts are 4 nucleated

C. Trophozoites colonise in the colon

D. The chromatid bodies are stained by iodides

✅ The correct answer is option Cysts are 8 nucleated.

278. In a patient with typhoid, diagnosis after 15 days of onset of fever is best done by_____________?

A. Blood culture

B. Widal test

C. Stool culture

D. Urine culture

✅ The correct answer is option Widal test.

279. Techoic acid is present in_____________?

A. Cell wall of Gram positive organisms

B. Cell wall of Gram negative organisms

C. Cytoplasm of Gram positive organisms

D. Cytoplasm of Gram negative organisms

✅ The correct answer is option Cell wall of Gram positive organisms.

280. Normal ratio of CD4 (T4) : CD8 (T8) is_________________?

A. 2:1

B. 1:2

C. 3:1

D. 1:3

✅ The correct answer is option 2:1.