MCQs in Microbiology: Miscellaneous Topics

1. Which of the following drug is used to treat fungal infections?a. erythromycinb. penicillinc. amphotericin Bd. Quininee. none of the above
2.  Pili/fimbraeare thin short appendages extruding from the cytoplasmic membrane of certain bacteria. These pili/fimbriae are involved ina. movementb. attachmentc. DNA transferd. a and be. b and c
3. What organism is considered an index of fecal pollution of drinking water supplies?a. Rotavirusb. E. colic. Salmonellaspp.d. Hepatitis E virus
4. Protective mechanisms used by bacteria to survive in the host maybea. capsulesb. M proteinc. various enzymesd. all of the above
5. Endotoxins are heat stable lipopolysaccharide-protein complexes that form the structural components of the cell wall of bacteria.Which of the following statement regarding endotoxin is correct?a. all have the same effect regardless of bacterial sourceb. are found in both gram-positive and gram-negative bacterial cell wallc. are part of the cell wall of gram-positive bacteria onlyd. none of the above statements are correct
6. Ethanol is one of the most commonly used disinfectants. Which concentration of ethanol is most effective for this purpose?a. 100%b. 70%c. 50%d. 30%
7. Which of the following arereservoirs for human infection?****a. food and waterb. humansc. animalsd. all of the above
8. ****Atypical growth curveconsists of FOUR phases. Which is the correct sequence?****a. exponential, lag, stationary, deathb. lag, exponential, stationary, deathc. stationary, exponential, lag, deathd. lag, stationary, exponential, death
9. Which of the following are**true about viruses?**a. they are not composed of cellsb. as virions they cannot metabolize nutrientsc. they alone cannot reproduce themselvesd. they contain DNA or RNAe. all of the above
10. The correct sequence for the**viral life cycle is:**a. attachment, biosynthesis, penetration, maturation, releaseb. penetration, biosynthesis, attachment, maturation, releasec. attachment, penetration, biosynthesis, maturation, released. biosynthesis, attachment, penetration, maturation, release

Answer Keys for MCQs in Microbiology (1-10)

1. c. amphotericin B
2. e. b & c (Attachment and DNA transfer)
3. b. E. coli
4. d. all of the above
5. a. all have the same effect regardless of bacterial source
6. b. 70%
7. d. all of the above
8. b. lag, exponential, stationary, death
9. e. all of the above
10. c. attachment, penetration, biosynthesis, maturation, release

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