Multiple Choice
In the context of the lipid bilayer, what is the primary role of cholesterol in the plasma membrane?
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8. Membrane Structure
The Lipid Bilayer
Multiple Choice
In the context of the lipid bilayer, what is the primary function of the cell (plasma) membrane?
A
It acts as a selectively permeable barrier that regulates the movement of substances into and out of the cell.
B
It synthesizes most of the cell’s ATP through oxidative phosphorylation.
C
It stores the cell’s genetic information and directs transcription.
D
It is the primary site of protein synthesis by ribosomes.
Verified step by step guidance1
Understand that the cell (plasma) membrane is a fundamental structure surrounding the cell, composed mainly of a lipid bilayer with embedded proteins.
Recall that the lipid bilayer creates a hydrophobic barrier that prevents free passage of most water-soluble substances, thus controlling what enters and leaves the cell.
Recognize that the term 'selectively permeable' means the membrane allows certain molecules to pass through while blocking others, maintaining the internal environment of the cell.
Differentiate the plasma membrane's function from other cellular components: ATP synthesis occurs in mitochondria, genetic information is stored in the nucleus, and protein synthesis happens at ribosomes.
Conclude that the primary role of the plasma membrane is to act as a selectively permeable barrier regulating the movement of substances into and out of the cell.
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