Which is a function of the cell membrane?
The cell membrane primarily functions to control what enters and leaves the cell, maintaining homeostasis. It is composed of a phospholipid bilayer and proteins that facilitate transport. Other options listed, such as photosynthesis and protein production, are not functions of the cell membrane.
The cell membrane, also known as the plasma membrane, plays a crucial role in maintaining the integrity of a cell by controlling its interactions with the external environment. Among the functions listed, the most accurate is that the cell membrane controls what enters and leaves the cell. This selective permeability allows essential substances, such as nutrients and ions, to enter while keeping harmful substances out.
The cell membrane is composed of a phospholipid bilayer with embedded proteins, which facilitate the transport of materials. For instance, small molecules like oxygen can diffuse freely across the membrane, while larger molecules may require specific transport proteins. Overall, the cell membrane is vital for regulating the internal conditions of the cell.
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