Bacteria need iron for growth. However, iron is not found in free form in the blood. So the bacteria may use which of the following mechanism(s) to obtain iron from the host?
A. Secrete enzymes that denature transferrin, a protein that is bound to iron
B. Ingest iron-rich proteins known as ferrosomes
C. Secrete chelating proteins known as siderophores
D. Extract iron from the hosts' own transferrin molecules
E. Both, secrete chelating proteins known as siderophores and extract iron from the hosts' own transferrin molecules
Answer: E. Both, secrete chelating proteins known as siderophores and extract iron from the hosts' own transferrin molecules
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