Multiple Choice
In the context of the lipid bilayer, what are the two main components of the cell (plasma) membrane?
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8. Membrane Structure
The Lipid Bilayer
Multiple Choice
In the context of the lipid bilayer, which structure primarily controls what goes in and out of the cell?
A
The cell wall
B
The selectively permeable plasma membrane
C
The centrosome
D
The nucleolus
Verified step by step guidance1
Step 1: Understand the components listed in the problem: the cell wall, the plasma membrane, the centrosome, and the nucleolus. Each has distinct functions within or around the cell.
Step 2: Recall that the cell wall is a rigid structure found in plant cells and some prokaryotes, providing support but not controlling molecular traffic.
Step 3: Recognize that the centrosome is involved in organizing microtubules during cell division, and the nucleolus is responsible for ribosomal RNA synthesis inside the nucleus.
Step 4: Focus on the plasma membrane, which is a lipid bilayer with embedded proteins that regulates the entry and exit of substances, making it selectively permeable.
Step 5: Conclude that the selectively permeable plasma membrane is the structure that primarily controls what goes in and out of the cell, based on its composition and function.
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