Select the corret statement form the following regrading cell membrance .

Options

A. Proteins make up 60 to 70% of the cell membrance
B. Lipids are arranged in a bilayer with polar heads towards the inner part
C. Fluid mosaic model of cell membrane was proposed by Singer and Nicoloson
D. `Na^(+)` and `K^(+)` ions move across cell membrne by passive transport

Explanation

To solve the question regarding the correct statement about the cell membrane, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: We need to select the correct statement regarding the cell membrane from the given options.

2. **Review the Fluid Mosaic Model**: The fluid mosaic model, proposed by Singer and Nicholson in 1972, describes the structure of the cell membrane. According to this model, the cell membrane is composed of a lipid bilayer that is fluid and contains various proteins embedded within it.

3. **Analyze the Options**: Without the specific options provided, we can infer that one of the options will likely describe the cell membrane as a fluid structure with proteins distributed throughout, which aligns with the fluid mosaic model.

4. **Select the Correct Option**: Based on the explanation provided in the video transcript, the correct option is option number 3, which accurately reflects the characteristics of the cell membrane as described by the fluid mosaic model.

5. **Conclude the Answer**: Therefore, the correct answer regarding the cell membrane is option number 3.

### Final Answer:
The correct statement regarding the cell membrane is option number 3.

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