1. Proteins are a chain sequence of amino acids, each link one of 20ish possibilities 2. These chains need to be folded in the right way for them to work properly 3. When they shape gets messed up, usually it just stops working (like when you fry an egg)
viruses don't want anything! they're not even alive in the conventional sense Just very complex particles that happen to be very good at reproducing Another example of this: does caffeine /want/ to reproduce? Probably not, but it's hijacked humans to do so anyway :)
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Another example is cancer; just a bit of a tweak that makes a cell harder to kill and more likely to proliferate and mutate and----boom
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Cancers are only different in that they're not usually communicable (although exceptions exist, if not in humans afaik)
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