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Which one of the following also acts as a catalyst in a bacterial cell?
A
23S rRNA
B
5S rRNA
C
snRNA
D
hnRNA
Detailed Solution
The ribosome has two subunits; in bacteria the large (50S) subunit contains 23S rRNA and 5S rRNA.
The formation of the peptide bond between two amino acids is catalysed by the 23S rRNA of the large subunit, which acts as the enzyme peptidyl transferase.
An RNA molecule that acts as an enzyme is called a ribozyme; the 23S rRNA is the ribozyme of bacteria.
5S rRNA is only a structural component of the ribosome.
snRNA and hnRNA occur in eukaryotic nuclei (splicing and precursor of mRNA) and are not found in bacteria.
Hence the 23S rRNA also acts as a catalyst in a bacterial cell.
The formation of the peptide bond between two amino acids is catalysed by the 23S rRNA of the large subunit, which acts as the enzyme peptidyl transferase.
An RNA molecule that acts as an enzyme is called a ribozyme; the 23S rRNA is the ribozyme of bacteria.
5S rRNA is only a structural component of the ribosome.
snRNA and hnRNA occur in eukaryotic nuclei (splicing and precursor of mRNA) and are not found in bacteria.
Hence the 23S rRNA also acts as a catalyst in a bacterial cell.