Table 203
the Following Data Were Obtained from a Broth Dilution

question 13

Multiple Choice

Table 20.3
The following data were obtained from a broth dilution test: $\begin{array} { | c | c | } \hline \text { Concentration of Antibiotic } \mathrm { X } & \text { Growth } \\\hline 2.0 \mu \mathrm { g } / \mathrm { ml } & \\\hline 1.0 \mu \mathrm { g } / \mathrm { ml } & \\\hline 0.5 \mu \mathrm { g } / \mathrm { ml } & \\\hline 0.25 \mu \mathrm { g } / \mathrm { ml } & + \\\hline 0.125 \mu \mathrm { g } / \mathrm { ml } & + \\\hline 0 & + \\\hline\end{array}$ Bacteria from the 0.25 µg/ml tube were transferred to new growth media containing antibiotic X with the following results: $\begin{array} { | c | l | } \hline \text { Concentration of Antibiotic X } & \text { Growth } \\\hline 2.0 \mu \mathrm { g } / \mathrm { ml } & \\\hline 1.0 \mu \mathrm { g } / \mathrm { ml } & + \\\hline 0.5 \mu \mathrm { g } / \mathrm { ml } & + \\\hline 0.25 \mu \mathrm { g } / \mathrm { ml } & + \\\hline\end{array}$
-The data in Table 20.3 show that these bacteria

• A) developed resistance to antibiotics.
• B) are pathogenic.
• C) were killed by 0.5 µg/ml of antibiotic X.
• D) were killed by 0.125 µg/ml of antibiotic X.
• E) were resistant to 1.0 µg/ml at the start of the experiment.

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