Table 20.3 The following data were obtained from a broth dilution test:

\begin{array}{|l|}\begin{array} { c | c } \hline \text { Concentration of Antibiotic }\\ \text { X } & \text { Growth } \\\hline 2.0 \mu \mathrm { g } / \mathrm { ml } & - \\\hline 1.0 \mu \mathrm { m } / \mathrm { ml } & - \\\hline 0.5 \mu \mathrm { g } / \mathrm { ml } & - \\\hline 0.25 \mu \mathrm { gl } / \mathrm { ml } & + \\\hline 0.125 \mu \mathrm { g } / \mathrm { ml } & + \\\hline 0 & + \\\hline\end{array}\end{array}

Bacteria from the 0.25 μg/ml tube were transferred to new growth media
Containing antibiotic X with the following results:

\begin{array}{|l|}\begin{array} { c | c } \hline \text { Concentration of Antibiotic }\\ \text { X } & \text { Growth } \\\hline 2.0 \mu \mathrm { g } / \mathrm { ml } & - \\\hline 1.0 \mu \mathrm { m } / \mathrm { ml } & + \\\hline 0.5 \mu \mathrm { g } / \mathrm { ml } & + \\\hline 0.25 \mu \mathrm { gl } / \mathrm { ml } & + \\\hline\end{array}\end{array}

The data in Table 20.3 show that these bacteria
A)are pathogenic.
B)developed resistance to antibiotics.
C)were killed by 0.125 μg/ml of antibiotic X.
D)were killed by 0.5 μg/ml of antibiotic X.
E)were resistant to 1.0 μg/ml at the start of the experiment.

Which of the Following Statements About Drugs That Competitively Inhibit

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