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  • Question
  • If a 1:600 dilution of a test compound kills a standard population of Staphylococcus aureus in 10 minutes but not 5 minutes while a 1:60 dilution of phenol kills the population in the same time, what is the phenol coefficient of the test compound?


  • Options
  • A. 1
  • B. 5
  • C. 10
  • D. 50

  • Correct Answer
  • 10 


  • More questions

    • 1. Marinated (sour pickled) fish should not have spoilage problems unless

    • Options
    • A. the acid content is very high
    • B. the acid content is low enough
    • C. the acid content is moderate
    • D. none of the above
    • Discuss
    • 2. Which family has received most interest in their development as a biological control agent against insects?

    • Options
    • A. Reoviridae
    • B. Baculoviridae
    • C. Iridoviridae
    • D. Poxviridae
    • Discuss
    • 3. Which of the following media is selective for Salmonella?

    • Options
    • A. Thiosulphate citrate bile salt agar
    • B. Wilson and Blair's brilliant-green bismuth sulphite agar medium
    • C. Bile salt agar
    • D. All of the above
    • Discuss
    • 4. __________ is an environment like __________ where microorganisms are functioning in an extremely thin film of water and where oxygen-containing air is close to them.

    • Options
    • A. low oxygen diffusion environment; soils
    • B. high oxygen diffusion environment; soils
    • C. low oxygen diffusion environment; lakes
    • D. high oxygen diffusion environment; lakes
    • Discuss
    • 5. Area of lysis on a bacterial lawn culture produced by a phage is known as

    • Options
    • A. pock
    • B. plaque
    • C. pox
    • D. all of these
    • Discuss
    • 6. Which of the following antibiotics can't be used for treatment of infections with ?-lactamase-producing Staphylococcus aureus?

    • Options
    • A. Vancomycin
    • B. Ampicillin/sulbactam
    • C. Cephalothin
    • D. Piperacillin
    • Discuss
    • 7. The reovirus and influenza virus contain

    • Options
    • A. 10 different segments of dsRNA and 8 different segments of ssRNA respectively
    • B. 8 different segments of dsRNA and 10 different segments of ssRNA respectively
    • C. 5 different segments of dsRNA and 7 different segments of ssRNA respectively
    • D. 7 different segments of dsRNA and 5different segments of ssRNA respectively
    • Discuss
    • 8. Which of the following bacteria is gram-negative cocci?

    • Options
    • A. Veillonella
    • B. Peptococcus
    • C. Peptostreptococcus
    • D. Sporosarcina
    • Discuss
    • 9. The growth of black-pigmented Bacillus nigrificans, a causative agent of black pickle is favoured by

    • Options
    • A. presence of carbohydrate like glucose
    • B. low level of available nitrogen
    • C. neutral or slightly alkaline brine
    • D. all of the above
    • Discuss
    • 10. Cloudiness of brine of glass-packed olives may be caused by

    • Options
    • A. the lactics if fermentation of residual sugar resumes
    • B. salt-tolerant bacteria
    • C. film yeasts or moulds if air is available
    • D. all of the above
    • Discuss


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