Question : Which of the following statements is correct regarding cell membranes?
I. The membrane is selectively permeable to some molecules present on either side of it.
II. Water may also move across this membrane from lower to higher concentration.
Option 1: Only II
Option 2: Only I
Option 3: Neither I nor II
Option 4: Both I and II
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Correct Answer: Only I
Solution : The correct answer is Only I.
The selective permeability of cell membranes is a key property. Cell membranes are made up of a lipid bilayer with proteins embedded in them. This structure enables them to regulate the flow of chemicals and ions into and out of the cell. Water normally travels across a cell membrane by osmosis, which includes water moving from areas of greater concentration to areas of lower concentration rather than from lower to higher concentration.
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