Which one of the following also acts as a catalyst in a bacterial cell? (a) 5S rRNA (b) snRNA (c) hnRNA (d) 23S rRNA
Option D The 23S rRNA is a component of the large prokaryotic (bacterial cell) subunit (50S). The ribosomal peptidyl transferase activity resides in this rRNA and acts as a ribozyme (catalytic RNA). In eukaryotic cells, the 60S (28S component) ribosome subunit contains the peptidyl transferase component and acts as the ribozyme.
