bacteria 1

bacteria 2

bacteria 3

bacteria 4

bacteria 5


bacteria 6


bacteria 7

bacteria 8

bacteria 9

Dichotomous Key for Bacteria

1A Gram Positive.............................................................................go to 2
1B Gram Negative............................................................................go to 6

2A Bacilli in shape............................................................................go to 3
2B Non-Bacilli in shape.....................................................................go to 4

3A Have expanded spores forming near one end................................Clostridium botulinum
3B Have spores forming in the center and are streptobacilli..................Bacillus anthracis

4A Are spirillum in shape.................................................................Treponema pallidium
4B Are coccus in shape....................................................................go to 5

5A Are streptococcus in shape..........................................................Streptococcus pneumonia
5B Are staphlococcus in shape..........................................................Neisseria gonorrhea

6A Have at least one flagella visible...................................................go to 7
6B Have no visible flagella................................................................Escherichia coli

7A Have only one enlarged flagellum.................................................Vibrio cholerae
7B Have more than one flagella.........................................................go to 8

8A Have 2 to 4 visible flagella...........................................................Bordetella petussis
8B Have more than 4 flagella............................................................Salmonella typhimurium