74
edits
Changes
Jump to navigation
Jump to search
Line 61:
Line 61: + + + + +
→Concept Bacteria
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.
===Learning objectives===
===Learning objectives===