Animal membranes contain

Options

A. Steroids
B. Chlorophyll
C. Prostaglandins
D. Vit. A.

Answer

To answer the question "Animal membranes contain", we will evaluate the options provided: steroids, chlorophyll, prostaglandins, and vitamin A.

### Step-by-Step Solution:

1. **Understanding Animal Membranes**:
- Animal cell membranes are primarily composed of a phospholipid bilayer, proteins, cholesterol, and carbohydrates.
- The presence of specific molecules is crucial for the structure and function of these membranes.

2. **Analyzing Each Option**:
- **Steroids**:
- Steroids are organic molecules characterized by a four-ring structure.
- Cholesterol, a type of steroid, is a significant component of animal cell membranes. It helps maintain membrane fluidity and stability.
- Therefore, this option is correct.

- **Chlorophyll**:
- Chlorophyll is a pigment found in plants that is essential for photosynthesis.
- It is not present in animal membranes.
- Thus, this option is incorrect.

- **Prostaglandins**:
- Prostaglandins are lipid compounds that have hormone-like effects and are involved in various physiological functions, including inflammation and pain response.
- They are not structural components of cell membranes.
- Therefore, this option is incorrect.

- **Vitamin A**:
- Vitamin A is a fat-soluble vitamin important for vision and immune function.
- While it is important for overall health, it is not a structural component of animal cell membranes.
- Thus, this option is incorrect.

3. **Conclusion**:
- Based on the analysis, the only correct component that is part of animal membranes is **steroids**, specifically cholesterol.

### Final Answer:
Animal membranes contain **steroids** (specifically cholesterol).