Science · Topic 54 of 64
Bacteria
⭐ MasteredBacteria are tiny living things made of just one cell. Some are helpful, like those that help us digest food, and some can cause illness.
💡 Fun fact
There are more bacteria in your body than there are human cells.
All about Bacteria
Bacteria are single-celled microorganisms found almost everywhere, from soil and oceans to the inside of the human body. Most are harmless or helpful, and some can cause illness.
Helpful bacteria in the gut help digest food, and bacteria are used to make yoghurt and cheese.
🎮 Try it yourself!
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Real-life uses of Bacteria
- Making yoghurt and cheese
- Breaking down waste in sewage plants
- Understanding why hand washing prevents illness
Frequently asked questions about Bacteria
Are all bacteria harmful?
No. Most bacteria are harmless or helpful.
How do antibiotics work?
Antibiotics kill or stop harmful bacteria, but they do not work against viruses.