Total number of amino acids in a hemoglobin molecule are__________?
Correct answer: C. 574
- A. 554
- B. 564
- C. 574
- D. 584
Explanation
Adult haemoglobin A has two alpha chains of 141 amino acids each and two beta chains of 146 amino acids each: (2 x 141) + (2 x 146) = 282 + 292 = 574 amino acids. Students often choose 564 by using an incorrect or incomplete chain length instead of adding all four globin chains.
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