Multiple Choice
In the context of the lipid bilayer, what is the primary function of the cell (plasma) membrane?
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8. Membrane Structure
The Lipid Bilayer
Multiple Choice
In the context of the lipid bilayer, what is a primary function of the cell (plasma) membrane?
A
To synthesize proteins by translating mRNA on ribosomes
B
To generate ATP through the citric acid cycle in the cytosol
C
To act as a selectively permeable barrier that regulates the movement of substances into and out of the cell
D
To store the cell’s genetic information in the form of DNA
Verified step by step guidance1
Identify the main components and functions of the cell (plasma) membrane, focusing on its role in the cell.
Recall that the plasma membrane is primarily composed of a lipid bilayer with embedded proteins, which together regulate what enters and leaves the cell.
Understand that the plasma membrane acts as a selectively permeable barrier, meaning it allows certain molecules to pass while blocking others, maintaining the internal environment of the cell.
Compare the given options with the known functions of the plasma membrane: protein synthesis occurs on ribosomes, ATP generation via the citric acid cycle happens in mitochondria or cytosol, and DNA storage is in the nucleus, not the membrane.
Conclude that the primary function of the plasma membrane is to regulate the movement of substances into and out of the cell by acting as a selectively permeable barrier.
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