Question

fill in the blank question
in total, hemoglobin molecules are composed of blank polypeptide chain(s) and blank heme group(s) (give numbers.)
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Explanation:

Step1: Recall hemoglobin structure

Hemoglobin has 4 polypeptide chains.

Step2: Recall heme - group number

Each polypeptide chain in hemoglobin has 1 heme group, so 4 heme groups in total.

Answer:

4, 4