In the chemistry of vision in mammals, the photosensitive substance is called

Options

A. Rhodopsin
B. Melanin
C. Sclerotin
D. Retinol

Answer

To answer the question "In the chemistry of vision in mammals, the photosensitive substance is called," we can follow these steps:

### Step 1: Understand the Options
The options provided are:
1. Rhodopsin
2. Melanin
3. Sclerotin
4. Retinol

### Step 2: Analyze Each Option
- **Rhodopsin**: This is a light-sensitive pigment found in the photoreceptor cells of the retina, specifically in the rods. It plays a crucial role in the ability to see in low light conditions.

- **Melanin**: This is a pigment responsible for the color of skin and hair. It is not involved in the photosensitivity of vision.

- **Sclerotin**: This is a component of the cuticle in arthropods and is not related to vision in mammals.

- **Retinol**: This is a form of vitamin A. While it is related to vision, it is not the photosensitive substance itself; rather, it is a component of rhodopsin.

### Step 3: Identify the Correct Answer
From the analysis, rhodopsin is the only option that is directly related to the photosensitivity involved in vision. Therefore, the correct answer is **Rhodopsin**.

### Final Answer
In the chemistry of vision in mammals, the photosensitive substance is called **Rhodopsin**.

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