Fundamentholfundamenthol
NEET2023Biology
Q.

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 subunits (two subunits of type and two subunits of type.)

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

  1. A

    Both Statement I and Statement II are true

  2. B

    Both Statement I and Statement II are false.

  3. C

    Statement I is true but Statement II is false.

  4. D

    Statement I is false but Statement II is true.

Solution

By convention, when a polypeptide is drawn as a line, the left end is the first amino acid (the N-terminus) and the right end is the last amino acid (the C-terminus). Statement I reverses these labels, so it is incorrect. Adult haemoglobin (HbA) is indeed a tetramer of subunits — Statement II is correct.

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