The chemical composition of vesicles, tubules and lamellae of a bacterial cell is/are

Options

A. phospholipids and proteins
B. protein only
C. carbohydrates and nucleic acids
D. amino sugars and proteins

Answer

### Step-by-Step Solution:

1. **Understanding the Components**: The question asks for the chemical composition of vesicles, tubules, and lamellae in a bacterial cell. These structures are integral to the cell's function and organization.

2. **Analyzing the Options**: We need to evaluate the provided options to determine which one accurately describes the composition of these structures.

3. **Option 1: Phospholipids and Proteins**:
- **Phospholipids**: These are a major component of cell membranes, forming a bilayer that is crucial for cell integrity and function. The structure of phospholipids includes a hydrophilic (water-attracting) head and two hydrophobic (water-repelling) tails.
- **Proteins**: These are essential for various cellular functions, including transport, signaling, and structural support. Proteins can be embedded within or associated with the phospholipid bilayer.

4. **Option 2: Protein Only**: This option suggests that vesicles, tubules, and lamellae are composed solely of proteins. This is incorrect as these structures also require phospholipids for their formation and function.

5. **Option 3: Carbohydrates and Nucleic Acids**: This option indicates that the composition includes carbohydrates and nucleic acids. While these molecules are important in cells, they do not constitute the primary components of vesicles, tubules, and lamellae.

6. **Option 4: Amino Sugars and Proteins**: This option also suggests a composition of amino sugars and proteins. Similar to option 2, this is incorrect as it overlooks the essential role of phospholipids.

7. **Conclusion**: Based on the analysis, the correct answer is **Option 1: Phospholipids and Proteins**. This combination accurately reflects the chemical composition of vesicles, tubules, and lamellae in bacterial cells.