Given below are two statements: 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 (N-terminal) Statement II: Adult human haemoglobin, consists of 4 subunits (two subunits of $\alpha$ type and two subunits of $\beta$ type.) In the light of the above statements, choose the correct answer from the options given below:

A Statement I is false but Statement II is true.

B Both Statement I and Statement II are true.

C Both Statement I and Statement II are false.

D Statement I is true but Statement II is false.

The answer is A.

Solution

The first amino acid is the N-terminal, so Statement I is incorrect.

Statement I is incorrect as the first amino acid is called as N-terminal amino acid and the last amino acid is called the C-terminal amino acid.

Concept N-terminal and C-terminal amino acids

107 questions from this chapter have appeared across 26 exam years.