Table 203 the Following Data Were Obtained from a Broth Dilution

question 37

Multiple Choice

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

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

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Definitions:

Capital Punishment

A legal penalty in some jurisdictions where the state executes a person as a punishment for a crime.

Uniformly Distributed

A distribution where all outcomes are equally likely to occur, each observation within a certain range has the same probability.

Null Hypothesis

The assumption in statistical testing that there is no significant difference or effect and that any observed difference is due to chance.

Significant Change

A noticeable or meaningful variation that occurs in data, indicating a departure from expected patterns or previous results.