Bacteria are microscopic organisms whose single cells have neither a membrane-enclosed nucleus or other membrane-enclosed organelles like mitochondria.They do not go through meiosis/mitosis for reproduction.The Gram Positive plasma membrane and both membranes in Gram negative bacteria are phospholipid bilayers but contain no cholesterol.
Prion: A infectious form of protein that may increase in number by converting related proteins to more prions.
When a prion enters a healthy organism, it controls proteins to convert into the disease-associated, prion form. Then the prion acts as a template to guide the misfolding of more protein into prion form. These newly formed prions can then go on to convert more proteins themselves, this triggers a chain reaction that produces large amounts of the prion form.
Virus: A small infectious agent that can replicate only inside the living cells of organisms.
Virus particles are made of genetic material composed of DNA or RNA, a protein coat that protects these genes, and in some cases an envelope of lipids that surrounds the protein coat when they are outside a cell.
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