Zero growth rate is observed during one of the phase of the bacterial growth curve______________?

Related Mcqs:

1. Which of the following structures, found external to the bacterial cell wall, are involved in bacterial attachment to cell surfaces?

   A. Capsule
   B. Flagella
   C. Pili
   D. Mesosomes

2. 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

3. Bacterial spores are destroyed by_______________?

   A. Boiling at 100°C
   B. Disinfection by hypochlorite solution
   C. Autoclave
   D. Pasteurisation

4. Bacterial cell does not possess___________________?

   A. dna
   B. Ribosome
   C. Mitochondria
   D. Cell wall

5. The structure in involved in bacterial attachment to cell surface is_______________?

   A. Capsule
   B. Fimbria
   C. Flagella
   D. None of the above

6. Electron microscopic examination of the bacterial flora of necrotising ulcerative gingivitis indicates the presence of microorganisms within non-necrotic tissues in advance of other bacteria. The organisms involved are______________?

   A. Cocci
   B. Spirochetes
   C. Bacteriophages
   D. Filamentous rods

7. The following are applicable to bacterial genoms except________________?

   A. It is composed of DNA
   B. It doe not contain histones
   C. It is circular
   D. Its DNA has both introns and extrons

8. Subacute bacterial endocarditis is caused by_____________?

   A. Streptococcus viridans
   B. Haemolytic streptococci
   C. Staphylococcus aureus
   D. Nisseria

9. Bacterial species which is protective or beneficial to the host is_______________?

   A. Streptococcus sanguis
   B. Porphyromonas gingivalis
   C. Treponema denticola
   D. Spirochetes

10. The viral action is differentiated from bacterial action by_________________?

    A. Interferon production
    B. Toxin production
    C. Lymphocytes production
    D. Neutrophils production