An infectious protein is a:

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An infectious protein is a prion, which is an abnormal form of a cellular protein that can cause normal prion proteins to become abnormal and misfold. This misfolding leads to the accumulation of these abnormal proteins in the brain, which results in the development of prion diseases. Viruses (A) are different from prions as they contain genetic material (DNA or RNA), a protein coat, and sometimes an outer envelope. Viroids (B) are smaller infectious agents that only contain RNA and do not have a protein coat. Virion (D) refers to the complete virus particle, composed of genetic material and protein coat, but not specific to prions. Prophage (E) is a term used for a bacterial virus (bacteriophage) that integrates its DNA into the host bacteria's chromosome.

An Infectious Protein Is A