By:Matt McQuaid

Defenition of Bacteria

a member of a large group of unicellular microorganisms that have cell walls but lack organelles and an organized nucleus, including some that can cause disease.
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-Most are smaller than our cells

-They are proyaryotic and unicellular

-They're membrane bound organelles

can be considered living or non-living

Bacteria are very small organisms, usually consisting of one cell. Many bacteria are so small that a million of them, laid end-to-end, would measure no more than about five centimeters. Bacteria are found everywhere, in the air, soil, water, and inside your body and on your skin.

Basic Shapes


-Bacilli-pill shaped

-Spirilla- spiral

Cell Wall

Around the outside of the cell membrane is the bacterial cell wall. Bacterial cell walls are made of peptidoglycan, which is made from polysaccharide chains cross-linked by unusual peptides containing D-amino acids

Obtaining Energy

Bacteria can be autotrauphs and heterotrophs so these 2 mthods of obtaining energy can be done

-Some swallow other organisms to obtain energy

-Others can produce theyre own energy

There are 2 main types of bacteria. Archaebacteria and Eubacteria
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Lyme Disease

an inflammatory disease characterized at first by a rash, headache, fever, and chills, and later by possible arthritis and neurological and cardiac disorders, caused by bacteria that are transmitted by ticks
Bacteria have survived since the beginning of time they were one of the first things that existed on Earth. They are extremely diverse and adaptive as well the survive in extreme cold, heat, underground.


Bacteria are prokaryotic organisms that reproduce sexually. Bacterial reproduction most commonly occurs by a kind of cell division called binary fission. Binary fission results in the formation of two bacterial cells that are genetically identical.


There are several types of bacteria movement. The most common occurs by the use of appendages called flagella. A bacterium can contain a single flagellum, several flagella located at one or both the bottom and top of the cell, or many flagella dispersed all over the bacterial surface

Harmful and Helpful Bacteria

Bacteria can serve many different purposes it can be both harmful and helpful

-E. Coli, Rhizobium, Helps in digestion of food

-Lyme Disease, Cause of food poisoning