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- Question
What is the direct cause of cell death by diphtheria toxin?
Options- A. Formation of an ion channel in the cell membrane
- B. Inactivation of a translational elongation factor
- C. Induction of apoptosis
- D. None of the above
- Correct Answer
- Inactivation of a translational elongation factor
- 1. The time temperature combination for HTST paterurization of 71.1°C for 15 sec is selected on the basis of
Options- A. Coxiella Burnetii
- B. E. coli
- C. B. subtilis
- D. C. botulinum Discuss
- 2. The amount of ATP that can be obtained by complete oxidation of a glucose by a bacterium is
Options- A. greater than by a yeast cell
- B. lesser than by a yeast cell
- C. exactly or approximately equal to by a yeast cell
- D. none of these Discuss
- 3. Which of the following clinical specimens can be used for the demonstration of rabies antigen by direct immunofluorescence antemortem?
Options- A. Salivary smears
- B. Corneal smears
- C. Conjunctival smears
- D. All of these Discuss
- 4. The milk streptococci produce acetoin that gets spontaneously oxidized yielding a flavorings agent (responsible for aroma of butter) that is
Options- A. acetone
- B. acetyl coA
- C. butyric acid
- D. diacetyl Discuss
- 5. The most common cause of urinary tract infection in the community is
Options- A. Klebsiella pneumoniae
- B. Proteus vulgaris
- C. Escherichia coli
- D. Citrobacter freundii Discuss
- 6. The primary stain of Gram's method is
Options- A. safranin
- B. phenolpthalene
- C. crystal violet
- D. methyl red Discuss
- 7. The third generation cephalosporin agents is
Options- A. cefotaxime
- B. cefoxitin
- C. cephalothin
- D. cephalexin Discuss
- 8. Bacterial soft rot is caused due to
Options- A. fermentation of pectin
- B. fermentation of sugars
- C. formation of ketones
- D. formation of amino acids Discuss
- 9. Genetic and biochemical similarities between contemporary cyanobacteria and eukaryotic chloroplasts are accepted to mean that
Options- A. eukaryotes evolved from bacteria
- B. eukaryotes evolved from archaea
- C. oxygenic photosynthesis first evolved in eukaryotes
- D. cyanobacteria arose from chloroplasts which escaped from plant cells Discuss
- 10. An endergonic reaction is one that
Options- A. requires energy in order to proceed
- B. releases energy for work
- C. gives off much heat
- D. looses energy Discuss
More questions
Correct Answer: Coxiella Burnetii
Correct Answer: greater than by a yeast cell
Correct Answer: All of these
Correct Answer: diacetyl
Correct Answer: Escherichia coli
Correct Answer: crystal violet
Correct Answer: cefotaxime
Correct Answer: fermentation of pectin
Correct Answer: eukaryotes evolved from archaea
Correct Answer: requires energy in order to proceed
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