26. Which of the following does not kill endospores? a) Autoclave b) Incineratio
ID: 280515 • Letter: 2
Question
26. Which of the following does not kill endospores? a) Autoclave b) Incineration c) Hot air sterilization d) Pasteurization e) None of the above 27. Which of the following is best to sterilize heat labile solutions? a) Dry heat b) Autoclave c) Membrane filtration d) Pasteurization e) None of the above Which of the following best describes the pattern of microbial death? a) The cells in a population die at a constant rate b) All the cells in a culture die at once c) All of the cells in a culture are never killed d) The patten varies depending on the antimicrobial agent e) The pattern varies depending on the species 28. Bacterial death will result from damage to which of the following structures? a) Cell wall b) Plasma membrane c) Proteins d) Nucleic acids e) All of the above 29. Which of the following is bactericidal? a) Membrane filtration b) Ionizing radiation c) Freeze-drying 30. d) Deep freezing e) All of the above 31. Which of the following is not a distinguishing characteristic of procaryotic cells Their DNA is not enclosed within a membrane a) b) They lack membrane-bounded organelles They have cell walls containing peptidoglycan c) d) Their DNA is not associated with histones e) None of the above
Explanation / Answer
Hi Answer:
26.Which of the following does not kill endospores?
Answer: Option D (Pasteurization)
Explanation: Pasteurization is the process of heating the liquid at mild temperature less than 100 degrees for a small time interval, this heating for small time is unable to kill the endospores. They can be killed by heating the liquid at 121 degrees for more than 30 minutes.
27. Which of the following is best to sterilize heat labile solutions?
Answer: Option C (Membrane filtration)
Explanation: All options other than membrane filter destroy the heat labile solutions because they are operated at high temperature.
28. Which of the following best describes the pattern of microbial death?
Answer: Option A (The cells in a population die at a constant rate.)
29. Bacterial death will result from damage to which of the following structures?
Answer: Option E (All of the above)
Explanation: All the components which are given in options are crucial for cell survival. Any damage to these structure leads to the cell death.
30. Which of the following is bactericidal?
Answer: Option B. (Ionizing radiation)
Explanation: The other techniques are not bactericidal in nature they just hibernate the cells but in case of ionizing radiations they kill the bacterial cells by damaging the DNA of cells.
31.Which of the following is not distinguishing characteristic of prokaryotic cells?
Answer: Option E (None of the above)
Explanation: The above all given points are the characteristic feature of a prokaryotic cell hence the right answer is the option E none of the above.
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