Cells: Here, There, Everywhere

Lesson 2.3: Cells: Here, There and Everywhere

By: Mrs. Gonzalez
Science Teacher
7th grade class

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Can you think of some other places single-celled organisms might be in our environment?

Multiple Select

Were you surprised to see living things in the yogurt we eat?

• Yes

• No

Summary

• Living things that are made entirely of one cell.

• This Cell are too small to be seen without a microscope.

• They do all the things that make something a living thing.

• These organisms use food for energy, grow and reproduce, and respond to stimuli.

• These creatures made of a single cell are living things.

Multiple Choice

Are You ready to learn about:

- Cells all around us and how they compare with the cells in our bodies.

• Yes
• Maybe

• No

Fun Fact:

​They are many bacteria living on many parts of your body.

There are many species of single-celled organisms. The most well known are the bacteria, but there are also others, such as single-celled fungi and algae.

• One teaspoon of that soil contains: - - over 1,000,000,000 bacteria cells.

  - about 120,000 fungi cells.

  - and 25,000 algae cells.

• These creatures come in a wide range of shapes, sizes, and colors.

Fun Fact:

Multiple Select

Did you ever happen to drink spoiled milk?

• Yes

• Don't remember

• No

Multiple Select

What Cause damage to the food you taste it?

• Bacteria and Algea

• Worm

• Living things

• It is organisms that caused the damage.

• When food spoils, it is usually because single-celled organisms have started to grow in it.

• When milk is expired or is left outside the refrigerator for too long, harmful bacteria can grow.

• These bacteria feed on the milk’s sugars and produce substances that make the milk “sour” and may also be poisonous to us.

• What is usually called “food poisoning” is due to consuming food containing harmful bacteria.

Multiple Choice

Single-Celled Organisms Are Often Helpful.

• True

• False

Multiple Choice

Did most of the oxygen we breathe is produced by single-celled organisms?

• True

• False

• Plants generally get the credit for making the oxygen we breathe, most of it is actually produced by single-celled organisms that live in the oceans.

• These algae and bacteria make their own food using energy from sunlight, just like plants, and give off oxygen. So not only are these single-celled organisms food for all the fish in the world, but they contribute a large part of our oxygen. Without them, people might not have enough oxygen to survive.

Multiple Select

How did we get most of the Oxygen?

• bacteria

• Sun

• plant

• Algae