The Question is from neet-botany cell-biology , and it was created by the author B VENKAT

Question

Lipid rafts are specialized microdomains within the cell membrane. Which of the following statements about their composition and function is INCORRECT?

B VENKAT · Accepted Answer

## CORE INFORMATION
✓ **Answer**: D
## CONCEPT FRAMEWORK
 **Primary Concept**: Lipid raft composition and properties
 **Related Topics**: Cell membrane structure, membrane fluidity, signal transduction
 **Prerequisites**: Understanding of lipid types (phospholipids, sphingolipids, cholesterol), membrane fluidity, and the functions of cell membranes.
## SOLUTION PATHWAY
**Given Information**:
The question asks to identify the incorrect statement about lipid rafts.
**Method & Steps**:
1. Analyze each option to determine its accuracy regarding lipid raft characteristics.
 Reasoning: Lipid rafts are known for their unique composition and functions within the cell membrane.
2. Evaluate the composition and properties of lipid rafts.
 Working: Lipid rafts are enriched in cholesterol and sphingolipids, leading to a more ordered and less fluid structure compared to the surrounding membrane. They play crucial roles in various cellular processes, including signal transduction and membrane trafficking.
 Key Point: The unique composition of lipid rafts is key to understanding their functions.
3. Identify the incorrect statement.
 Result: Option D is incorrect because lipid rafts are NOT primarily composed of unsaturated phospholipids and peripheral membrane proteins.  Instead, they are enriched in saturated lipids (sphingolipids) and cholesterol.
 Verification: Check the established knowledge of lipid raft composition.
## OPTION ANALYSIS
A ✓: They are enriched in cholesterol and sphingolipids. (Correct)
B ✓: They are involved in signal transduction and membrane trafficking. (Correct)
C ✓: They exhibit reduced fluidity compared to the surrounding membrane. (Correct)
D :x: They are primarily composed of unsaturated phospholipids and peripheral membrane proteins. (Incorrect)
## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing the lipid composition of lipid rafts with the overall composition of the cell membrane: Lipid rafts have a distinct composition that differs from the surrounding membrane.
  2.Overlooking the role of cholesterol in lipid raft formation and function: Cholesterol is crucial for the structural integrity and function of lipid rafts.
 **Quick Tips**:
  1.Remember the key components of lipid rafts: cholesterol, sphingolipids.
  2.Associate lipid rafts with increased order and reduced fluidity compared to the surrounding membrane.

B VENKAT · Answer

They are enriched in cholesterol and sphingolipids.

B VENKAT · Answer

They are involved in signal transduction and membrane trafficking.

B VENKAT · Answer

They exhibit reduced fluidity compared to the surrounding membrane.

B VENKAT · Answer

The correct Option is "They are primarily composed of unsaturated phospholipids and peripheral membrane proteins."

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