In Eukaryotic Cells,we Sometimes Find Reverse Transcriptase Activity,even Though the Cells

Multiple Choice

In eukaryotic cells,we sometimes find reverse transcriptase activity,even though the cells are not infected with virus.This activity can be attributed to

A) the presence of transposons integrating into polymerase genes.
B) the presence of viroids.
C) the presence of retrotransposons.
D) infection with small bacteria known as mycoplasmas.
E) a novel prion infection.