Multiple Choice
In cell biology, what is the plasma (cell) membrane primarily made of?
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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 synthesizes proteins for secretion by catalyzing peptide bond formation.
B
It acts as a selectively permeable barrier that regulates movement of substances into and out of the cell.
C
It is the main site of ATP production via the citric acid cycle in the cytosol.
D
It stores the cell’s genetic information and controls gene expression.
Verified step by step guidance1
Step 1: Understand the structure of the cell (plasma) membrane, which is primarily composed of a lipid bilayer with embedded proteins.
Step 2: Recognize that the lipid bilayer creates a hydrophobic barrier that separates the interior of the cell from the external environment.
Step 3: Identify the role of the membrane proteins in facilitating selective transport, signaling, and communication across the membrane.
Step 4: Connect these structural features to the function of the membrane as a selectively permeable barrier that controls the movement of substances into and out of the cell.
Step 5: Differentiate this function from other cellular processes such as protein synthesis, ATP production, and genetic information storage, which occur in other organelles or cellular components.
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