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Question
Biology
Posted 9 months ago
A microbiologist inoculates bacteria A into a culture medium. Following incubation, both bacteria A and bacteria B are determined to be growing in this culture. What is the most likely explanation?
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Answer from Sia
Posted 9 months ago
Answer
The most likely explanation is that bacteria B was already present in the culture medium before inoculation.
Solution
a
Contamination: Bacteria B could have been a contaminant present in the culture medium before the inoculation of bacteria A
b
Cross-contamination: During the inoculation process, there might have been cross-contamination from another source containing bacteria B
Key Concept
Contamination in microbiological cultures
Explanation
Contamination is a common issue in microbiological experiments. It can occur due to improper sterilization of the culture medium or equipment, or through accidental introduction of foreign microorganisms during the inoculation process.

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