Which one of the following statements is not correct?

  • Option 1)

    Retinal is the light absorbing portion of visual photo pigments.

  • Option 2)

    In retina the rods have the photopigment rhodpsin while cones have three different photopigments.

  • Option 3)

    Retinal is a derivative of vitamin C.

  • Option 4)

    Rhodopsin is the purplish red protein present in rods only.

 

Answers (1)

 

Visual cortex -

the photosensitive compounds (photopigments) in the human eyes is composed of opsin (a protein) and retinal (an aldehyde of vitamin A). Light induces dissociation of the retinal from opsin resulting in changes in the structure of the opsin. This causes membrane permeability changes.

- wherein

As a result, potential differences are generated in the photoreceptor cells. This produces a signal that generates action potentials in the ganglion cells through the bipolar cells. These action potentials (impulses) are transmitted by the optic nerves to the visual cortex area of the brain, where the neural impulses are analysed and the image formed on the retina is recognised based on earlier memory and experience.

 

 Retinal is a derivative of VItamin A, not Vitamin C

 


Option 1)

Retinal is the light absorbing portion of visual photo pigments.

incorrect option

Option 2)

In retina the rods have the photopigment rhodpsin while cones have three different photopigments.

incorrect option

Option 3)

Retinal is a derivative of vitamin C.

correct option

Option 4)

Rhodopsin is the purplish red protein present in rods only.

incorrect option

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