What does a single hemoglobin molecule consist of?

Show Answers

Four polypeptide chains composed of 2 alpha, 1 beta, and 1 gamma chainFour heme groups along with four polypeptide chainsTwo alpha and two beta chains combined with four heme groupsOne heme group attached to one globin protein

Explanation

Option D is correct because a single hemoglobin subunit is made up of one heme group bound to one globin protein. The other options describe the entire hemoglobin tetramer or incorrect compositions.