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Identify the light sensitive pigment w...

Identify the light sensitive pigment which is an aldehyde of vitamin A attached to protien -opsin

A

Iodopsin

B

Erythrolabe

C

Chlorolabe

D

Rhodopsin

Text Solution

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Question**: The question asks for a light-sensitive pigment that is an aldehyde of vitamin A attached to a protein called opsin. 2. **Identifying Key Terms**: - **Light-sensitive pigment**: This refers to a pigment that can absorb light and initiate a visual signal. - **Aldehyde of vitamin A**: Vitamin A exists in various forms, and one of its aldehyde forms is crucial for vision. - **Opsin**: This is a protein that binds with the aldehyde form of vitamin A to form a pigment. 3. **Exploring the Structure of the Eye**: The eye has three layers: - Outer layer: Sclera - Middle layer: Choroid - Inner layer: Retina 4. **Identifying Photoreceptor Cells**: The retina contains photoreceptor cells, which are of two types: - **Rods**: Responsible for twilight vision and contain the pigment rhodopsin. - **Cones**: Responsible for daylight vision and contain different pigments. 5. **Focusing on Rods and Rhodopsin**: - The rods contain the pigment rhodopsin, which is crucial for low-light vision. - Rhodopsin is composed of a protein (opsin) and a derivative of vitamin A (specifically, 11-cis-retinal, which is an aldehyde form of vitamin A). 6. **Conclusion**: The light-sensitive pigment that is an aldehyde of vitamin A attached to the protein opsin is **rhodopsin**. **Final Answer**: Rhodopsin ---
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