Bacteria that are spherical in shape are classified as
coccus (singular) or cocci (plural). Four examples of cocci are shown here at 1000
X magnification: Staphylococcus , Micrococcus , Streptococcus and Sarcina . Staphylococcus
and Micrococcus tend to form grapelike clusters,
while Streptococcus aligns in chains. Sarcina
divides into three planes, forming eight cells arranged in a cube.
In the two-dimensional views shown here only the front four cells are
visible, appearing as four cocci aligned in a cube (a tetrad).
Click on each image to see the enlarged version.
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| 1. Staphylococcus |
2. Staphylococcus |
3. Micrococcus |
4. Micrococcus |
5. Streptococcus |
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| 6. Streptococcus |
7. Streptococcus |
8. Sarcina |
9. Sarcina |
10. Sarcina |
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