cells of E.coli are placed in a solution with 12% Nacl . which effect would be visible after 24th of incubation?
(1) plasmolysis
(2) plasmoptysis
(3) osmotic lysis
(4) swelling of cells
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Plasmolysis effect would be visible after 24th of incubation.
Option: (1)
Explanation:
- E.coli belongs to enterobacteriaceae. As a result it does not tolerate the extreme of the salt.
- This is due to its cell membrane. 12% NaCl solution means hypertonic solution as compared to the bacteria.
- As water moves from hypotonic solution to the hypertonic solution, the ‘water diffuses’ out of the cell of the bacteria.
- As a result there is destruction of the plasma membrane. This process is known as plasmolysis. This method is applied in preservatives for the killing of the bacteria.
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