Human haemoglobin (Hb) has

primary structure

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secondary structure

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tertiary structure

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quaternary structure

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Solution

The correct option is D quaternary structure
Some proteins are an assembly of more than one polypeptide or subunits. These polypeptides or subunits are arranged with respect to each other and form the quaternary structure of a protein. For example: Human haemoglobin (Hb) has quaternary structure consisting of four subunits - two subunits of α type and two subunits of β type.

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