Question

1. Competitive binding for host nutrients is a mechanism employed by which of the following S. aureus factors?

A. fur regulator

B. siderophores

C. catalase

D. coagulase

2. Which of the following is NOT an example of nutritional immunity?

A. mcrophages pumping ferrous iron (Fe2+) out of their phagosomes

B. human serum protiens binding hemoglobins and free heme released from lysed red blood cells

C. S. aureus transcriptional repressor protien Fur sensing iron- poor conditions

D. lactoferrin sequestering free ferric iron (fe3+) on mucosal surfaces