Bacteria need iron for growth. However, iron is not found in free form in the blood. So how do bacteria obtain iron?
A. Secrete enzymes that denature transferrin, a protein that is bound to iron.
B. Ingest chelating proteins known as siderophores
C. Secrete chelating proteins known as siderophores
D. Extract iron from the hosts' own transferrin molecules
E. Both Secrete siderophores and extract iron from the hosts' own transferrin molecules
Ans: E. Both Secrete siderophores and extract iron from the hosts' own transferrin molecules
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