Understanding Microorganisms and Antibiotics

What is a key characteristic of microorganisms that makes them difficult to see individually?

• They are transparent.

• They are extremely small.

• They move very quickly.

• They blend with their environment.

Why is it important to use bell jars in the experiment with mold and bacteria?

• To keep the temperature constant.

• To prevent contamination of the experiment and the environment.

• To provide light for the mold to grow.

• To add moisture to the setup.

What accidental event led to Alexander Fleming's discovery of penicillin?

• He left the Petri dish open overnight.

• He intentionally added mold to the Petri dish.

• Mold from his sandwich fell into the Petri dish.

• He mixed two different types of bacteria.

How does penicillin affect bacteria?

• It makes them resistant to antibiotics.

• It damages their cell walls.

• It strengthens their cell walls.

• It enhances their growth.

What is the ongoing challenge between mold and bacteria?

• Mold and bacteria are trying to coexist peacefully.

• Mold is trying to become resistant to bacteria.

• Bacteria are developing resistance to mold's antibiotics.

• Mold is trying to eliminate all bacteria.