Question

Statement I: A protein is imagined as a line, the left end represented by first amino acid (C-terminal) and the right end represented by last amino acid (Nterminal).

Statement II: Adult human haemoglobin, consists of 4 subunits (two subunits of a type and two subunits β type.)

In the light of the above statements, choose the correct answer from the options given below:

Options

• Both statement I and Statement II are false.

• Statement I is true but Statement II is false.

• Statement I is false but Statement II is true.

• Both statement I and Statement II are true.

Answer 1

Statement I is false but Statement II is true.

Explanation:

• Statement I is false: A protein’s left end is represented by the N-terminal, while the right end is represented by the C-terminal. The N-terminal contains an amino group (−NH₂) while the C-terminal contains a carboxyl group (COОН.).
• Statement II is true: haemoglobin is a tetrameric protein. It consists of four subunits: two alpha (α) and two beta (β) types. Subunits interact to produce a complex protein structure that transports oxygen in the bloodstream.