Multiple Choice
In the context of the lipid bilayer, which cellular structure is primarily composed of a phospholipid bilayer?
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8. Membrane Structure
The Lipid Bilayer
Multiple Choice
In cell biology, what is the primary structural component that makes up the cell (plasma) membrane?
A
A network of actin filaments that forms a rigid barrier
B
A cellulose cell wall made of glucose polymers
C
A phospholipid bilayer with embedded proteins
D
A layer of triglycerides arranged in a monolayer
Verified step by step guidance1
Understand that the cell (plasma) membrane is a fundamental structure that separates the interior of the cell from its external environment.
Recall that the primary structural component of the plasma membrane is a bilayer made up of molecules called phospholipids, which have hydrophilic heads and hydrophobic tails.
Recognize that this phospholipid bilayer forms a flexible, semi-permeable barrier that controls the movement of substances in and out of the cell.
Note that embedded within this bilayer are various proteins that serve functions such as transport, signaling, and structural support.
Eliminate other options: actin filaments form part of the cytoskeleton inside the cell, cellulose cell walls are found in plant cells but not in the plasma membrane, and triglycerides do not form the membrane structure.
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