A) The ear ossicle attached to tympanic membrane is malleus.
B) Opsin (of rhodopsin) develops from vitamin A.
C) The pressure on ear drum is equalised by Eustachian tube.
D) Otolith organ consists of saccule and utricle.
Correct Answer: B
Solution :
[b] The photopigments of the human eye are composed of opsin (protein) and retinal. Upon light absorption, opsins can change their conformation from a resting state to a signalling state. Then it activates the G protein, thereby resulting in a signalling cascade that produces physiological responses. Retinal, also called retinaldehyde or vitamin A aldehyde, is a polyene chromophore which is bound to proteins called scotopsins and photopsins, and is the chemical basis of animal vision.
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