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Answer :
Final answer:
The plasma membrane of a cell is selectively permeable, which permits some substances to pass through while preventing others. It is permeable to water and small, nonpolar molecules, while large polar molecules and charged ions require special mechanisms for transport.
Explanation:
The plasma membrane of the cell is selectively permeable, which means it allows certain substances to pass through while blocking others. It is permeable to water, among other molecules, through specific channels and mechanisms. The plasma membrane consists of a lipid bilayer which helps it to be selectively permeable. Only relatively small, nonpolar materials like lipids, oxygen, and carbon dioxide gases, can move through the lipid bilayer without assistance. Large polar molecules and charged ions, such as sodium, potassium, calcium, and chloride ions, cannot freely cross this membrane; they require a special means of transport, such as passive (non energy-requiring) or active (energy-requiring) transport processes. This balanced system of selective permeability is crucial to maintain the cell's functionality and survival.
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