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ZingPath: Cell Structure

The Structure of Bacteria

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Cell Structure

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Lesson Focus

The Structure of Bacteria

Life Science

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You will use a dichotomous key to classify animals into different groups, or classes. After this, you will be given detailed information on eight classes of animals.

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Now You Know

After completing this tutorial, you will be able to complete the following:

  • Explain that organisms are classified according to their characteristics.
  • Give examples of organisms that are amphibians, reptiles, birds, mammals, fish, arthropods, mollusks, and annelids.
  • Explain that a dichotomous key is used to identify organisms in nature, and that it consists of a series of questions with two choices for answers that ultimately lead to the name of the correct organism.

Everything You'll Have Covered

1. What is the largest group of organisms living on Earth?

~ Bacteria are the largest group of organisms living on Earth.

2. What are bacteria?

~ Bacteria are unicellular microorganisms with prokaryotic cells.

3. What is the purpose of a bacterial cell wall?

~ The cell wall of bacteria gives shape and strength to the cell. It also prevents bursting in case excess water is absorbed by the cell.

4. What part of the cell is located just inside the cell wall, and what is its purpose?

~ The cell membrane is located inside the cell wall and controls the flow of materials entering and exiting the cell. In some bacteria, the cell membrane forms extensions called pili.

5. How do bacteria cells differ from eukaryotic cells?

~ Eukaryotic cells have a nucleus and membrane-enclosed organelles and bacteria do not.

6. How are bacteria and eukaryotic cells alike?

~ Both bacteria and eukaryotic cells have ribosomes. They both also have a cell membrane and cytoplasm.

7. What are plasmids?

~ Plasmids are small strands of circular DNA that contain a few genes, and can be found in bacteria.

Tutorial Details

Approximate Time 20 Minutes
Pre-requisite Concepts There are no specific pre-requisite concepts necessary.
Course Life Science
Type of Tutorial Animation
Key Vocabulary amphibian, animal, annelid