Extrinsic and intrinsic proteins found in plasma membrane are in the ratio

Options

A. `70:30`
B. `30:70`
C. `40:60`
D. `60:40`

Answer

To determine the ratio of extrinsic to intrinsic proteins found in the plasma membrane, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Composition of the Plasma Membrane**:
- The plasma membrane, also known as the cell membrane, is primarily composed of a phospholipid bilayer with embedded proteins.

2. **Identify the Types of Proteins**:
- There are two types of proteins associated with the plasma membrane:
- **Extrinsic Proteins**: These proteins are located on the surface of the membrane.
- **Intrinsic Proteins**: These proteins span across the membrane and are embedded within the phospholipid bilayer.

3. **Determine the Percentage of Each Type of Protein**:
- According to the information provided:
- Intrinsic proteins account for **70%** of the total protein content in the plasma membrane.
- Extrinsic proteins account for **30%** of the total protein content.

4. **Calculate the Ratio**:
- To find the ratio of extrinsic to intrinsic proteins, we express the percentages as a ratio:
- Extrinsic proteins : Intrinsic proteins = 30% : 70%
- This can be simplified by dividing both numbers by 10:
- 30 : 70 = 3 : 7

5. **Final Answer**:
- Therefore, the ratio of extrinsic to intrinsic proteins in the plasma membrane is **3:7**.