According to sandwitch model the thickness of each protein layer and the bilipid layer, respectively

Options

A. 75 and `35 A^@`
B. `35 and 75A^@`
C. `35 and 20A^@`
D. `20 and 35A^@`

Answer

To answer the question regarding the thickness of each protein layer and the bilipid layer according to the sandwich model, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding the Sandwich Model**:
- The sandwich model describes the structure of cell membranes, where there are two layers of proteins (the "bread") surrounding a lipid bilayer (the "filling").

2. **Identifying Components**:
- In the sandwich model, the two outer layers are made of hydrated proteins (globular proteins), and the inner layer is the lipid bilayer.

3. **Thickness Values**:
- According to the sandwich model, the thickness of the protein layers is approximately 75 Å (angstroms) and the thickness of the lipid bilayer is about 35 Å.

4. **Conversion to Nanometers**:
- To convert angstroms to nanometers, we use the conversion factor where 1 Å = 0.1 nm.
- Therefore, the protein layer thickness of 75 Å converts to 7.5 nm, and the lipid bilayer thickness of 35 Å converts to 3.5 nm.

5. **Final Answer**:
- Thus, according to the sandwich model, the thickness of each protein layer is 75 Å (or 7.5 nm) and the thickness of the lipid bilayer is 35 Å (or 3.5 nm).