(A) The correct answer is $A$. Ribosomal $RNA$ $(r-RNA)$ acts as a structural and catalytic component of the ribosome. Specifically,the $23S$ $r-RNA$

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(A) The correct answer is $A$. Ribosomal $RNA$ $(r-RNA)$ acts as a structural and catalytic component of the ribosome. Specifically,the $23S$ $r-RNA$ in prokaryotes (and $28S$ $r-RNA$ in eukaryotes) functions as a ribozyme,which is an enzyme made of $RNA$ that catalyzes the formation of peptide bonds between amino acids during protein synthesis.