Which of the following situations could lead to biological contamination?

• A. Labeling samples accurately
• B. Storing chemicals in sealed containers
• C. Using unsterilized laboratory equipment
• D. Wearing gloves while handling specimens

Answer: (C)

Verified step by step guidance

1. Understand the concept of biological contamination: it occurs when unwanted microorganisms are introduced into a sample, environment, or experiment, potentially affecting results or safety.
2. Evaluate each option by considering whether it introduces or prevents microorganisms from contaminating the sample or environment.
3. Labeling samples accurately helps prevent mix-ups but does not introduce contamination, so it is unlikely to cause biological contamination.
4. Storing chemicals in sealed containers prevents exposure to microorganisms, thus reducing the risk of contamination.
5. Using unsterilized laboratory equipment can introduce microorganisms directly into samples or cultures, making it a common source of biological contamination.
6. Wearing gloves while handling specimens is a protective measure that reduces contamination risk by preventing direct contact with microorganisms.