Microscopic Life: Bacteria

Bacteria are the smallest and most numerous living organisms on Earth, found almost everywhere. They are single-celled and lack a nucleus, making them unique. Bacteria play a crucial role in food production, such as in yogurt, but can also cause infections and diseases. Despite their potential harm, bacteria are vital for decomposing organic matter, recycling nutrients, and aiding human digestion. They are essential for life on Earth and contribute to medicine production.

What distinguishes bacterial cells from other types of cells?

• They have a large size.

• They are multicellular.

• They lack a nucleus.

• They have a complex nucleus.

Which of the following foods is made using bacteria?

• Bread

• Yogurt

• Pasta

• Rice

Which of these diseases can be caused by bacteria?

• Strep throat

• Common cold

• Chickenpox

• Malaria

How do bacteria contribute to the ecosystem?

• By consuming large animals

• By causing diseases

• By decomposing organic matter

• By producing oxygen

In what way are bacteria essential for human digestion?

• They produce digestive enzymes.

• They help break down food.

• They absorb nutrients.

• They store energy.