Multiple Choice
Which of the following best describes how the cell wall protects a plant cell?
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6. The Membrane
Biological Membranes
Multiple Choice
Which of the following molecules add stiffness and strength to the plasma membrane?
A
Phosphatidylcholine
B
Actin
C
Cholesterol
D
Glycogen
Verified step by step guidance1
Understand the structure and function of the plasma membrane: The plasma membrane is a phospholipid bilayer that provides a flexible barrier for the cell. It contains various molecules, including lipids, proteins, and carbohydrates, which contribute to its properties.
Identify the role of cholesterol in the plasma membrane: Cholesterol is a lipid molecule that integrates into the phospholipid bilayer. It interacts with the fatty acid tails of phospholipids, reducing their movement and increasing membrane stiffness and strength.
Eliminate incorrect options: Phosphatidylcholine is a type of phospholipid that forms part of the bilayer but does not specifically add stiffness. Actin is a cytoskeletal protein that provides structural support inside the cell, not within the membrane. Glycogen is a carbohydrate used for energy storage and is not involved in membrane structure.
Conclude that cholesterol is the correct answer: Cholesterol's unique structure allows it to modulate membrane fluidity and provide mechanical stability, making it essential for maintaining the integrity of the plasma membrane.
Summarize the key concept: Cholesterol is the molecule that adds stiffness and strength to the plasma membrane by interacting with phospholipids and reducing their mobility.
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