What are the total number of amino acids found in a haemoglobin molecule?
Correct answer: C. 574
- A. 575
- B. 576
- C. 574
- D. 573
Explanation
Correct option: C (fact) (There are 574 amino acids in a haemoglobin molecule).A haemoglobin molecule consists of a total of 574 amino acids. It is made up of four protein chains: two alpha chains and two beta chains. Each alpha chain consists of 141 amino acids, and each beta chain consists of 146 amino acids. Therefore, the total number of amino acids in a haemoglobin molecule is 2 * 141 (alpha chains) + 2 * 146 (beta chains) = 282 + 292 = 574. Hence, option C is the correct answer.
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Proteins are polymers of amino acids joined by peptide bonds, and their function depends on primary, secondary, tertiary and quaternary structure. The topic covers fibrous and globular proteins, enzymes, antibodies, hormones and transport proteins, as well as denaturation by heat or extreme pH.
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