If bacteria living in salty seawater were displaced to a freshwater environment the cell structure that would prevent the cells from rupturing is the cell wall.
The cell wall can be described as an external covering present in plant and bacterial cells that help a cell in protection as well as stability.
The bacterial cell wall is made up of peptidoglycan. If a bacteria living in salty sea water is moved to fresh water then, the cell wall is the structure that will help in its survival.
The cell wall will prevent an excess amount of water to enter the cell so that the levels of salt can be maintained inside the cell. Also, the cell wall will not let the salts to move out of the cell hence preventing the cell from rupturing.
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