Staphylococcus aureus is a pathogenic bacterium that can inf…
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Stаphylоcоccus аureus is а pathоgenic bacterium that can infect a wide range of host species, including humans. S. aureus has a particular protein that binds with hemoglobin from the host organism. Hemoglobin is the iron-containing protein used to transport oxygen in the blood. Since iron is important for growth, S. aureus have evolved the ability to absorb the iron from the host's hemoglobin. Different S. aureus strains preferentially infect different hosts and have different amino acid sequences at their hemoglobin-binding domains (Table 1; letters indicate different amino acids). In an experiment, different S. aureus strains were mixed with hemoglobin from macaque monkeys and their binding ability was measured (Figure 1). The differences in amino acid sequences contributed to the differential binding abilities observed. Table 1. Selected amino acid sequences and preferred host for four strains of S. aureus S. aureus Strain Amino Acid Sequence Host Species 1 Q Q F Y H Y A R S Species A 2 R Q A Y H Y A R T Species B 3 Q Q A Y H Y A R T Macaque 4 R Q A A H Y Q L T Species C The horizontal axis is labeled S. aureus Strain, and the numbers 1, 2, 3 and 4 are indicated. The vertical axis is labeled Percent Hemoglobin Binding, and the numbers 0 through 100, in increments of 10, are indicated. The data represented in the graph are as follows. Note that all values are approximate. S. aureus Strain 1, 25 percent hemoglobin binding. S. aureus Strain 2, 60 percent hemoglobin binding. S. aureus Strain 3, 97 percent hemoglobin binding. S. aureus Strain 4, 35 percent hemoglobin binding. Figure 1. Macaque hemoglobin binding ability of different strains of S. aureus Which of the following experiments would be most appropriate to determine whether populations of S. aureus are continuously adapting in order to obtain iron from hosts more effectively?
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