Multiple Choice
How do unsaturated fatty acids help maintain membrane fluidity at lower temperatures?
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6. The Membrane
Biological Membranes
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What is the function of a cell's selectively permeable plasma membrane?
A
To synthesize proteins for the cell
B
To store genetic information
C
To provide structural support to the cell
D
To regulate the movement of substances in and out of the cell
Verified step by step guidance1
Understand the structure of the plasma membrane: The plasma membrane is composed of a phospholipid bilayer with embedded proteins, cholesterol, and carbohydrates. This structure allows it to be selectively permeable.
Define selective permeability: Selective permeability means that the plasma membrane allows certain molecules or ions to pass through it by means of active or passive transport, while preventing others.
Identify the role of the plasma membrane: The primary function of the plasma membrane is to regulate the movement of substances in and out of the cell, maintaining homeostasis.
Differentiate from other cell functions: While the plasma membrane regulates substance movement, protein synthesis is primarily the function of ribosomes, and genetic information storage is the role of the nucleus.
Conclude the function: Based on the understanding of selective permeability and the role of the plasma membrane, its main function is to control the entry and exit of substances, ensuring the cell's internal environment remains stable.
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