Viruses are obligatory intracellular parasites which contain a single type of nucleic acid and a protein coat to surround that nucleic acid, they lack enzymes for protein synthesis and ATP generation.
Prions are proteinaceous infectious particle. Prion disease, such as CJD and mad cow disease involve the degeneration of brain tissue and results from altered protein. Viroids are infectious infectious pieces of RNA that cause some plant diseases, such as potato spindle tuber viroid disease.
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