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Vitamin A: Chemistry, Functions and Disorders
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Vitamin A: Chemistry, Functions and Disorders
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Vitamin A: Chemistry, Functions and Disorders
Growth retardation is due to impairment in skeletal formation, resulting in:
lack of vitamin B
excess of vitamin A
lack of vitamin A
Defficiency of vitamin D
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Vitamin A: Chemistry, Functions and Disorders
Color sensitive pigments that govern colored vision, included:
Porphyropsin
Iodopsin
Cynopsin
All of above
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Vitamin A: Chemistry, Functions and Disorders
The number of cones in human body is, approximately:
2 million
3 million
5 million
7 million
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Vitamin A: Chemistry, Functions and Disorders
In eye, abnormal dryness of conjunctiva, cornea and keratinization of epithelial cells is caused by vitamin A deficiency, named as:
Xerophthalmia
Night blindness
Conjunctivitis
Color blindness
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Vitamin A: Chemistry, Functions and Disorders
Cones’ are involved in:
Bright light vision
colored vision
Projection
All of above
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Vitamin A: Chemistry, Functions and Disorders
β-ionone ring is present in:
Retinal
Retinol
Retinoid
Cortex
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Vitamin A: Chemistry, Functions and Disorders
‘vitamers’ of vitamin ‘A’ includes:
Retinal
Retinol
Retinoic acids
All of above
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Vitamin A: Chemistry, Functions and Disorders
Oxidation of retinal yields:
Retinol
Carotenes
Retinoic acids
Ligases enzymes
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Vitamin A: Chemistry, Functions and Disorders
Retinol’ and ‘retinal’ are:
Similar in function
Interconvertible
Vitamin K derivatives
Enzymes inhibition
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Vitamin A: Chemistry, Functions and Disorders
Number of rods in human eyes, approximately
1 million
11 million
12 million
90 million
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