Bacterial Shape Classification

Lesson Plan - Get It!

Audio:

The medical personnel quickly realized it was cholera, caused by the bacteria vibrio cholerae.

Vibrio cholerae bacteria are found in brackish water. When people came in contact with the contaminated water, they became infected. Doctors and researchers were able to identify the bacteria and implement treatment plans.

Before moving on, if you missed, or need to review, the previous five Related Lessons in this Viruses and Bacteria series, find them in the right-hand sidebar.

Bacteria are mighty little microbes that come in many shapes, which allows doctors and researchers to quickly identify the more common bacterial diseases. Bacteria can be classified two ways: by shape and by organization in groups.

The most common shapes are the coccus, bacillus, and spirillum, but there are many more bacterial shapes overall. The image below shows six of the more common shapes:

Bacteria are also classified by organization in groups. The prefix Diplo- means two, which means they come together in pairs. The prefix Staphylo- refers to grape-like, which means they come together in clusters. The prefix Strepto- means in chains, which means that the bacteria come together in straight lines.

A pair of coccus-shaped bacteria would be called diplococcus.

• What would a pair of bacillus-shaped bacteria be called?

A chain of bacillus is called streptobacilli.

• What do you think a chain of coccus would be called?

Use the illustration below to check to see if you were correct:

Fill in the blanks and answer the questions for Lesson Six, Bacterial Shape Classification, in your Viruses and Bacteria Unit Workbook, as you watch the video on bacteria classification below.

(If you didn't print out this resource in Lesson One, please download and print it from Downloadable Resources in the right-hand sidebar.)

Bacteria Classification by Shape, by Biology Professor:

•  Why is it important for doctors to be able to use these methods to identify bacteria?

Bacteria are classified by their shape and how they organize themselves into groups. This makes it easier and quicker for medical personnel to identify what bacteria may be infecting a person.

In the Got It? section, you will review all five shapes and three ways bacteria organize by groups, while making a slide show presentation.