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very small, simple organisms, but they do everything that larger, multicellular organisms do. include viruses.
efficient single-celled organisms, with an envelope surrounding the cytoplasm, which contains the DNA.
not alive: lack metabolic system, unable to reproduce it takes over the protein making machinery of the host cell to produce more viral genetic material (DNA or RNA). nothing can fight them (no medication).
bacteria, archea, and eurkarya
most basic division among all organisms on earth is among these three
they are eukaryotic, single cells organisms. examples: paramecium, slime mold, brown algae, diatom
causes sickle-cell anemia, transmitted by paramecium, confers resistance to malia, common in north america.
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