Group II Self-Splicing Introns -pre-rRNA of fungal and plant mitochondria -majority of chloroplast introns -several classes -require Mg 2+ -no cofactor.

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Group II Self-Splicing Introns -pre-rRNA of fungal and plant mitochondria -majority of chloroplast introns -several classes -require Mg 2+ -no cofactor

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E. coli Ribosome -70S particle, MW ~2.5 x dissociable into small (30S) and large (50S) subunits -30S contains 16S RNA, 21 polypeptides -50S contains 5S, 23S RNA + 31 polypeptides “Although the ribosome has been crystallized…it is such a complex entity that it will be many years before its structure is known in molecular detail” - Voet and Voet, Biochemistry 1995

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