Multiple Choice
Which of the following best describes the structure of the lipid bilayer as shown in the image?
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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
To store the cell’s genetic information for inheritance and protein synthesis
B
To act as a selectively permeable barrier that regulates the movement of substances into and out of the cell
C
To provide the main site of protein synthesis by hosting ribosomes for translation
D
To generate ATP by carrying out oxidative phosphorylation across its surface
Verified step by step guidance1
Identify the main components and structure of the cell (plasma) membrane, which is primarily composed of a lipid bilayer with embedded proteins.
Understand that the lipid bilayer creates a hydrophobic interior that prevents free passage of most water-soluble substances, thus controlling what enters and leaves the cell.
Recognize that the plasma membrane's selective permeability allows the cell to maintain homeostasis by regulating the internal environment.
Distinguish the plasma membrane's function from other cellular components: genetic information storage occurs in the nucleus, protein synthesis mainly happens at ribosomes, and ATP generation is primarily a mitochondrial function.
Conclude that the primary role of the plasma membrane is to act as a selectively permeable barrier that regulates the movement of substances into and out of the cell.
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