Question

multiple choice question
which term describes a once pure culture that has since had unwanted microbes of uncertain identity introduced into it?

• contaminated
• mixed
• axenic
• differential

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Explanation:

• "Contaminated" means a culture (originally pure) has unwanted microbes (contaminants) introduced.
• "Mixed" implies a culture with multiple known microbes, not unwanted/uncertain ones.
• "Axenic" is a pure culture with no other microbes.
• "Differential" relates to media/tests, not culture contamination. So the correct term is "Contaminated".

Answer:

A. Contaminated