Aviroid is a(n) capsid without nucleic acid. provirus. infectious protein. complete, infectious virus particle. infectious piece of rna without a capsid.

A viroid is an infectious piece of RNA without a capsid. A viroid is an infectious RNA molecule, which is similar to a virus, however, not quite the same thing. It's smaller than a virus and has no capsid. It is a coiled "naked" RNA molecule that can affect a cell. An example of human disease that is known to be caused by Viroid is hepatitis D.

From a high concentration to a low concentration.

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