Biology · Molecular Biology

Following statements were made about catalytic introns: A. Group I introns may undergo self-splicing by transesterification. B. Group II introns do not require any factor/protein for autosplicing either in vivo or in vitro. C. Certain introns of both the group I and II classes may contain open reading frames which are translated into protein. D. Generally, group I introns migrate by DNA-mediated mechanisms, whereas group II introns migrate by RNA-mediated mechanisms. E. Ribonuclease P (RNase P) is essential for bacteria and archaea but not eukaryotes. Which one of the following combinations represents statements which are all correct?