Materials

■ Petri dish with nutrient agar

■ glass-marking pen

■ 4 sterile cotton swabs

■ distilled water

■ protective gloves

Background

1. Culturing bacteria involves growing microorganisms in a nutrient medium that is favorable for growth.

2. What are favorable conditions for the growth of most bacteria?

3. List some places in your school where bacteria are likely growing.

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