Test: ACT Science

Three different species of bacteria were grown in the laboratory. The experiment measured the effect of pH on the concentration of the three species of bacteria. The graphs below show the concentration of bacteria at different pH levels. Figure 2 shows the effect of pH on the concentration of a third bacterial strain, bacteria C.

Graph2

1.

Which of the following is not an accurate conclusion that can be drawn from the graph in Figure 1?

A medium with a pH of 8.0 would consist of a higher concentration of bacteria A than bacteria B

Both bacteria A and bacteria B can coexist in an environment with a pH of 8.4

A medium with a pH of 11.0 would consist of solely bacteria B

Bacteria A is able to survive in an environment with low pH

The concentration of bacteria A is affected by the concentration of bacteria B

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