Final answer:
Foods contaminated with pathogenic bacteria may not always have a noticeable change in appearance, taste, or smell. It is important to handle and prepare food properly to minimize the risk of bacterial contamination.
Step-by-step explanation:
Foods contaminated with pathogenic bacteria may not always have a noticeable change in appearance, taste, or smell. Pathogenic bacteria are bacteria that can cause disease when consumed. While some contaminated foods may exhibit signs such as foul odor or discoloration, others may appear normal but still carry harmful bacteria. It is important to handle and prepare food properly to minimize the risk of bacterial contamination.