Question

select the word in each sentence to make it correct.

1. hemoglobin consists of (click to select) chains.
2. there are two (click to select) chains and two beta chains.
3. each of the protein chains is conjugated to a nonprotein (click to select) group.
4. this group contains an (click to select) ion in the center.
5. this center portion will reversibly bind (click to select)

Explanation:

1. Hemoglobin is a quaternary - structured protein. It has four polypeptide chains.
2. In adult hemoglobin, there are two alpha chains and two beta chains.
3. Each polypeptide chain (globin) is conjugated to a non - protein heme group.
4. The heme group contains an iron ion (\(Fe^{2+}\)) at its center.
5. The iron - containing heme group can reversibly bind oxygen.

Answer:

1. four
2. alpha
3. heme
4. iron
5. oxygen