Who proposed the first lameller model of biomembranes

Options

A. Danielli and Davson
B. Robertson
C. Helleir and Hoffmann
D. Singer and Nicolson

Answer

**Step-by-Step Solution:**

1. **Understand the Concept of Biomembranes:**
- Biomembranes are essential structures in cells, primarily composed of a phospholipid bilayer. This bilayer consists of two layers of phospholipids, which have hydrophilic (polar) heads and hydrophobic (non-polar) tails.

2. **Identify the Structure of the Biomembrane:**
- The structure includes two layers of phospholipids and proteins. The proteins can be classified as integral proteins (embedded within the bilayer) and peripheral proteins (attached to the surface).

3. **Historical Context:**
- The first lamellar model of biomembranes was proposed based on physiological studies conducted in the early 20th century.

4. **Name the Proposers:**
- The model was proposed by James Danneley and Hugh Devson in the year 1935.

5. **Summarize the Model:**
- According to Danneley and Devson, the biomembrane consists of four molecular layers: two layers of phospholipids and two layers of proteins.

**Final Answer:**
The first lamellar model of biomembranes was proposed by James Danneley and Hugh Devson in 1935.

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