Multiple Choice
In the context of the lipid bilayer, which structure primarily controls what enters and leaves the cell?
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8. Membrane Structure
The Lipid Bilayer
Multiple Choice
In cell biology, what is the plasma (cell) membrane primarily made of?
A
A cellulose matrix reinforced by chitin fibers
B
A rigid peptidoglycan sheet containing membrane-bound ribosomes
C
A single layer of triglycerides with peripheral DNA
D
A phospholipid bilayer with embedded proteins
Verified step by step guidance1
Understand that the plasma membrane is a fundamental structure that separates the interior of the cell from its external environment.
Recall that the plasma membrane is primarily composed of a double layer of phospholipids, known as a phospholipid bilayer, which provides a flexible matrix.
Recognize that embedded within this bilayer are various proteins that serve functions such as transport, signaling, and structural support.
Note that other options like cellulose, chitin, peptidoglycan, or triglycerides do not describe the plasma membrane's main composition in animal cells.
Conclude that the plasma membrane's primary structure is a phospholipid bilayer with embedded proteins, which allows selective permeability and communication.
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