Question

Arrange the following according to the level of protein structures:

a) lysozyme, b) haemoglobin, c) Individual chains of insulin, d) hairs

Options

A
d, a, c, b
B
a, b, c, d
C
d, c, b, a
D
c, d, a, b

Explanation

The correct order is c, d, a, b:

Insulin: This is a hormone composed of two peptide chains with a specific amino acid sequence, representing its primary structure.

Hair (Keratin): The structural protein keratin in hair forms alpha-helices, indicative of a secondary structure.

Lysozyme: This enzyme has a complex three-dimensional folding, typical of a tertiary structure.

Hemoglobin: Composed of four subunits, hemoglobin exemplifies a quaternary structure.

Other options incorrectly sequence the proteins based on their structural complexity.

This option incorrectly orders the proteins based on their structural levels. Keratin (in hair) is not tertiary, and lysozyme is not secondary.

This option is incorrect because it misorders the proteins. Hemoglobin is quaternary, not secondary, and insulin is primary, not tertiary.

This option is incorrect as it does not correctly sequence the proteins according to their structural levels. Insulin should be primary, not quaternary.

This is the correct order based on the level of protein structures. Insulin is primary, keratin (in hair) is secondary, lysozyme is tertiary, and hemoglobin is quaternary.