Frmae work molecules in biomembranes are

Options

A. glycolipids
B. phospholipids
C. glycoproteins
D. oligosaccharides

Answer

### Step-by-Step Solution:

1. **Understanding Biomembranes**: Biomembranes are essential structures that form the boundaries of cells and organelles. They are primarily composed of various molecules that contribute to their structure and function.

2. **Identifying Framework Molecules**: The question asks for the framework molecules in biomembranes. The main components that provide structure to the biomembranes include:
- **Phospholipids**: These are the primary building blocks of biomembranes. They consist of a hydrophilic (water-attracting) "head" and two hydrophobic (water-repelling) "tails." In a bilayer arrangement, the hydrophobic tails face inward, while the hydrophilic heads face outward towards the aqueous environment.
- **Glycolipids**: These are lipids with carbohydrate chains attached. They play a role in cell recognition and signaling.
- **Glycoproteins**: These are proteins with carbohydrate groups attached. They are involved in cell recognition and communication.
- **Oligosaccharides**: Short chains of sugar molecules that can be attached to proteins and lipids, contributing to the cell's recognition processes.

3. **Phospholipid Bilayer**: The phospholipid bilayer is fundamental to the structure of biomembranes. It provides a flexible yet stable barrier that separates the internal environment of the cell from the external environment.

4. **Fluid Mosaic Model**: According to the fluid mosaic model, the biomembrane is described as a mosaic of various components (phospholipids, proteins, cholesterol, etc.) that can move laterally within the layer, giving the membrane fluidity.

5. **Conclusion**: The primary framework molecules in biomembranes are phospholipids, along with other components like glycolipids and glycoproteins that contribute to the overall structure and function of the membrane.

### Final Answer:
The framework molecules in biomembranes are **phospholipids**, along with **glycolipids**, **glycoproteins**, and **oligosaccharides**.

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