Which of the following is a potential contamination source that could result in inaccurate microbiological results during laboratory experiments?

• A. Labeling samples correctly
• B. Wearing gloves while handling cultures
• C. Using unsterilized glassware
• D. Incubating cultures at the recommended temperature

Answer: (C)

Verified step by step guidance

1. Understand that contamination in microbiological experiments refers to the unintended introduction of microorganisms that can alter the results.
2. Review each option to identify which action could introduce unwanted microbes: labeling samples correctly, wearing gloves, using unsterilized glassware, and incubating at recommended temperature.
3. Recognize that labeling samples correctly and incubating at recommended temperatures are good laboratory practices that help ensure accurate results, not contamination sources.
4. Understand that wearing gloves helps prevent contamination by protecting samples from microbes on hands.
5. Identify that using unsterilized glassware is a potential contamination source because it can carry residual microorganisms, leading to inaccurate microbiological results.