Multiple Choice
In the context of the lipid bilayer, what structure forms the outer boundary of most cells?
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8. Membrane Structure
The Lipid Bilayer
Multiple Choice
In the context of the lipid bilayer, which cellular structure is primarily composed of a phospholipid bilayer?
A
The centriole
B
The ribosome
C
The nucleolus
D
The plasma (cell) membrane
Verified step by step guidance1
Understand that the lipid bilayer is a fundamental structural component of certain cellular membranes, primarily composed of phospholipids arranged in two layers.
Recall the main cellular structures listed: centriole, ribosome, nucleolus, and plasma (cell) membrane, and consider their composition and function.
Recognize that centrioles are made of microtubules, ribosomes are composed of RNA and proteins, and the nucleolus is a dense region within the nucleus involved in ribosome synthesis, none of which have a phospholipid bilayer.
Identify that the plasma (cell) membrane is the cellular structure that consists mainly of a phospholipid bilayer, which forms a semi-permeable barrier around the cell.
Conclude that the plasma membrane is the correct answer because it is primarily composed of the phospholipid bilayer, essential for controlling the movement of substances in and out of the cell.
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