Final answer:
The primary function of the cell membrane is to control the entry and exit of substances, ensuring the cell maintains its internal environment. It achieves this through selective permeability facilitated by its unique structure. Other functions mentioned, like photosynthesis and protein production, are carried out by different parts of the cell.
Explanation:
Function of the Cell Membrane
The cell membrane, also known as the plasma membrane, plays a critical role in maintaining the health and functionality of a cell. One of its primary functions is to control what enters and leaves the cell. This selective permeability is essential for cellular homeostasis, allowing necessary substances like nutrients to enter, while keeping out harmful materials.
The cell membrane is composed of a phospholipid bilayer with embedded proteins, which facilitate the transport of molecules. For instance, molecules can pass through the membrane via various mechanisms such as diffusion, osmosis, and active transport. In contrast to the options provided, the cell membrane does not perform functions like photosynthesis, producing proteins, or providing energy to the cell; these functions are primarily associated with organelles like chloroplasts and ribosomes.
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