The purplish red pigment rhodopsin contained in the rods type of photoreceptor cells of the human eye, is a derivative of

Options

A. Vitamin A
B. Vitamin `B_(1)`
C. Vitamin C
D. Vitamin D

Answer

To answer the question about the purplish-red pigment rhodopsin found in the rod photoreceptor cells of the human eye, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Type of Photoreceptor Cells**:
- The human eye contains two types of photoreceptor cells: rods and cones. Rods are responsible for vision in low light conditions.

2. **Understand the Function of Rhodopsin**:
- Rhodopsin is the pigment found in rod cells. It plays a crucial role in enabling vision under dim light conditions.

3. **Composition of Rhodopsin**:
- Rhodopsin is composed of two main components: opsin (a protein) and a chromophore known as 11-cis-retinal.

4. **Identify the Source of 11-cis-retinal**:
- The 11-cis-retinal is a derivative of vitamin A. This means that vitamin A is essential for the formation of rhodopsin.

5. **Evaluate the Options**:
- The options provided are vitamin A, vitamin B1, vitamin C, and vitamin D.
- Since we established that rhodopsin is derived from vitamin A, we can conclude that this is the correct answer.

6. **Conclude the Answer**:
- Therefore, the purplish-red pigment rhodopsin contained in the rod type of photoreceptor cells of the human eye is a derivative of **vitamin A**.

### Final Answer:
The purplish-red pigment rhodopsin is a derivative of **vitamin A**.

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