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An aldehyde of vitamin A is...

An aldehyde of vitamin A is

A

retinal

B

opsin

C

iris

D

comea

Text Solution

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The correct Answer is:
To determine the aldehyde of vitamin A, we can follow these steps: ### Step-by-Step Solution: 1. **Identify Vitamin A**: Vitamin A is a fat-soluble vitamin that is important for vision, immune function, and skin health. It exists in several forms, including retinol, retinal, and retinoic acid. 2. **Understand Aldehyde Structure**: Aldehydes are organic compounds containing a functional group with the structure -CHO. This means that the carbon atom is double-bonded to an oxygen atom and single-bonded to a hydrogen atom. 3. **Explore the Options**: The question provides several options: - A) Retinal - B) Opsin - C) Iris - D) Cornea 4. **Analyze Each Option**: - **Retinal**: Also known as retinaldehyde, it is indeed an aldehyde form of vitamin A. It plays a crucial role in the visual cycle. - **Opsin**: This is a protein found in photoreceptors of the retina, not an aldehyde. - **Iris**: This is the colored part of the eye and does not relate to vitamin A. - **Cornea**: This is the transparent front part of the eye and is not an aldehyde. 5. **Conclusion**: Based on the analysis, the correct answer is **Retinal (Retinaldehyde)**, which is the aldehyde form of vitamin A. ### Final Answer: The aldehyde of vitamin A is **Retinal (Retinaldehyde)**. ---
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A list of steps involved in mechanism of vision is given below in a random order. (i)Neural impulses are analysed and image formed on retina is recognised by visual cortex. (ii)Membrane permeability changes (iii)Ganglion cells are excited (iv)Bipolar cells are depolarised (v)Action potentials (impulse) are transmitted by optic nerves to visual cortex. (vi)Potential differences are generated in the photoreceptor cells. (vii)Light energy causes a change in shape of rhodopsin, leading to the dissociation of retina (an aldehyde of vitamin A ) from opsin (a protein) (viii)Structure of opsin is changed. Which of the following options represents these events in a correct order ?

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