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- Question
Which binding is inhibited by pactamycin?
Options- A. Aminoacyl-tRNA to the A-site of 30S subunit
- B. Initiator-tRNA to 30S/40S initiation complexes
- C. Peptidyl t-RNA to the 50S subunit
- D. Formation of peptide bond in P site
- Correct Answer
- Initiator-tRNA to 30S/40S initiation complexes
- 1. Semi-solid media, prepared with agar at concentrations of 0.5% or less are useful for the cultivation of
Options- A. Microaerophillic bacteria
- B. Lactobacilli
- C. E.coli
- D. all of these Discuss
- 2. When a substance is added to a liquid medium which inhibits the growth of unwanted bacteria and favors the growth of wanted bacteria, it is known as
Options- A. differential medium
- B. enriched medium
- C. enrichment medium
- D. selective medium Discuss
- 3. Microbes can be removed from a liquid solution by the process of
Options- A. filtration
- B. freeze-drying
- C. osmosis
- D. desiccation Discuss
- 4. The viral DNA is removed from the host's chromosomes and the lytic cycle occurs. The process is called
Options- A. spontaneous induction
- B. inductive infection
- C. resultant induction
- D. spontaneous infection Discuss
- 5. Plate counts are often reported as
Options- A. cfu
- B. cfu/ml
- C. Both (a) and (b)
- D. thousands/ml Discuss
- 6. The chief spoilage organisms on smoked fish are
Options- A. molds
- B. bacteria
- C. both (a) and (b)
- D. fungi Discuss
- 7. HIV or Human Immunodeficiency Virus is considered unique because each virus contains:
Options- A. more than 100 copies of the viral genome
- B. a genome made up of both DNA and RNA components
- C. a viral enzyme known as reverse transcriptase
- D. sticky proteins that allow it to bind tightly to host cells Discuss
- 8. The concentration of agar to obtain semi solid media is
Options- A. 1.5-20%
- B. 0.5% or less
- C. >10%
- D. >10%but<20% Discuss
- 9. The butyric acid type of fermentation in acid or medium acid foods, with swelling of the container by the carbon dioxide and hydrogen gas is caused by
Options- A. C. butyricum
- B. C. pasteurianum
- C. both (a) and (b)
- D. C. sporogenes Discuss
- 10. Complete destruction of the microorganisms is commonly known as
Options- A. disinfection
- B. sterilization
- C. antisepsis
- D. none of these Discuss
More questions
Correct Answer: Microaerophillic bacteria
Correct Answer: enrichment medium
Correct Answer: filtration
Correct Answer: spontaneous induction
Correct Answer: cfu/ml
Correct Answer: molds
Correct Answer: a viral enzyme known as reverse transcriptase
Correct Answer: 0.5% or less
Correct Answer: both (a) and (b)
Correct Answer: antisepsis
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