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Question

Match the following:

Column~IColumn~II(i) Haemoglobin(1) Fibrous protein(ii)Keratin(2) Non-essential(iii)Glycine(3) α 2 β 2(iv)Valine(4) Essential

A
i-3, ii-1, iii-2, iv-4
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B
i-2, ii-3, iii-4, iv-1
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C
i-1, ii-2, iii-3, iv-4
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D
i-3, ii-1, iii-4, iv-2
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Solution

The correct option is A i-3, ii-1, iii-2, iv-4
Haemoglobin is an iron-containing pigment protein that gives blood its red colour. It exists in a quaternary structure composed of two α- chains and two β -chains (α 2 β 2).

Keratins are fibrous proteins present in eukaryotes. They can occur as helical ⍺-keratin or β-keratin. In vertebrates, almost the entire dry weight of hair, wool, feathers, nails, horns, hooves and the majority of the outer skin layer occur as α-keratin.

Glycine is the simplest amino acid where the R group is hydrogen. It is a non-essential amino acid as it can be synthesised by the body.

Valine is an aliphatic essential amino acid in humans.

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