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From Karnataka Open Educational Resources
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, 07:33, 30 August 2013
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| Bacteria are neither plant nor animal. Both bacteria and plants have rigid cell walls, but unlike plants, <br>most kinds of bacteria move about and use organic foods for energy and growth; only a few use photosynthesis.<br> | | Bacteria are neither plant nor animal. Both bacteria and plants have rigid cell walls, but unlike plants, <br>most kinds of bacteria move about and use organic foods for energy and growth; only a few use photosynthesis.<br> |
| On the basis of their shapes,bacteria may be grouped into three main type; | | On the basis of their shapes,bacteria may be grouped into three main type; |
| + | [[File:Shapes of Bacteria.jpg|200px|left]] |
| + | *the rod-shaped bacilli, which often have small whiplike structures known as Flagella that propel the organism; |
| + | *the spherical cocci (singular coccus), which may grow in chains (streptococci, or strep germs," <br>as in strep throat) or which may clump together like a bunch of grapes Istrphylococci); |
| + | *and the comma or spiral shape spirilla and prirochetes (one of which is the cause of syphilis). <br> |
| + | other kind of bacteria, the mycoplasmas, have no rigid cell walls and consequently are called pleuropneumonialike organisms,<br> because they cause a contagious pneumonia in cows and human beings. |
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| ===Learning objectives=== | | ===Learning objectives=== |