Looking at Your Results of the Ames Test Using Bacteriological

question 1

Multiple Choice

Looking at your results of the Ames test using bacteriological agar medium plates lacking the amino acid histidine, you ?nd that there are many colonies growing on the agar. How do you interpret this result?

• A) The bacterium has turned its operon genes on, producing proteins necessary for growth.
• B) The chemical being tested is mutagenic.
• C) The bacterium does not have any plasmids, so it cannot grow on the medium.
• D) The drug being tested has no inhibitory effect on the bacterium; therefore, it is not a good antibiotic to give for treatment of disease.

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Definitions:

Assumption

A statement accepted as true without proof, often forming the basis of an argument or hypothesis.

MT

Modus Tollens, a form of logical argument or a rule of inference allowing one to deduce a conclusion from a hypothetical proposition and its denial.

Add

In context, add might not be a specific key term without further context; it typically means to combine or sum quantities in mathematics.

Assumption

Something presumed to be true or certain to occur, even without evidence.