What are microorganisms?

These organisms consist of one single cell called unicellular organisms. Also, they are very small. We need a microscope to observe them. How do we call them?

Choose if the statement either is true or false:

All microorganisms come in same size and forms.

• True

• False

Answer explanation

Microorganisms come in many sizes and forms.

In ancient times some investigators (scientists) had already questioned:

• They observed that small organisms can be found in human organs.

• Whether or not the diseases human beings had may be caused by microorganisms.

• Microorganisms infect others and can be found in water and food.

What were the three type of microorganisms illustrated in the video?

• Viruses, fungi and bacteria.

• Yeast, mold and bacteria.

• Bacteria, viruses and antibiotics.

Bacteria are ​ (a)   cells. They have no ​ (b)   . Some of them are ​ (c)   in food fermentation. By contrast, other bacteria are ​ (d)   and may cause ​ (e)   .

• prokaryotic
• nucleus
• useful
• harmful
• infections

Viruses are not living beings. Sometimes they can infect them and live inside them. Some viruses cause _______ like flu, diarrhea, or chickenpox.

Some fungi are ​ (a)   than bacteria or viruses. They can be ​ (b)   in the air, water or plants. Some like ​ (c)   are used to make ​ (d)   .

• bigger
• found
• yeasts
• foods

How can you prevent and avoid getting infected?

• Treat them with antibiotics.

• Vaccinations is important to prevent diseases.

• Good hygiene habits.