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virus virus is a tiny, non-living particle bacteria smallest and simplest living thing virus cannot reproduce without a host bacteria has no orgnelles and no nucleus; it is a prokaryote bacteria contains it's genetic material in ta circular chromosome virus typically lasts 7-10 days bacteria transmitted by air, water, human contact and contaminated food virus can enter and reproduce in only a few types of cells bacteria has cells walls that protect it from outside pressure virus can have an outer layer called an envelope virus these are "intracellular paracites" virus it's 2 types of reproduction are lytic and lysogenic bacteria it's 2 types of reproduciton are binary fission and conjugation bacteria can have a hard, outer convering called an Endospore to protect it from harsh environments bacteria ex. botulism, tetanus virus ex. herpes, H1N1, HIV