Cell recognition and adhesion are facilitated by components of plasma membrane. These components are generally

Options

A. lipids
B. proteins
C. both (1) & (2)
D. glycolipids and glycoproteins

Answer

### Step-by-Step Solution:

1. **Understanding Cell Recognition and Adhesion**:
- Cell recognition and adhesion are crucial processes that allow cells to identify and interact with each other. This is essential for various biological functions, including tissue formation and immune responses.

2. **Components of the Plasma Membrane**:
- The plasma membrane is composed of various molecules, including lipids, proteins, glycolipids, and glycoproteins. Each of these components plays a role in the membrane's structure and function.

3. **Role of Proteins**:
- Proteins in the plasma membrane have specific shapes that allow them to function as receptors. These receptors are involved in chemical signaling between cells, facilitating communication and adhesion.

4. **Role of Glycolipids and Glycoproteins**:
- Glycolipids and glycoproteins are specialized molecules found on the outer surface of the plasma membrane. They have carbohydrate chains that extend out from the membrane and are essential for cell recognition. These molecules help cells identify each other and are involved in adhesion processes.

5. **Identifying the Correct Answer**:
- Given the options:
- A) Lipids
- B) Proteins
- C) Both one and two
- D) Glycolipids and glycoproteins
- The most accurate answer is **D) Glycolipids and glycoproteins**, as these components are specifically involved in cell recognition and adhesion.

### Final Answer:
The components of the plasma membrane that facilitate cell recognition and adhesion are generally **glycolipids and glycoproteins**.

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