Question

Which one of the following also acts as a catalyst in a bacterial cell?

• A. 23S rRNA
• B. 5S rRNA
• C. snRNA
• D. hn RNA

Answer 1

The correct option is A

23S rRNA

The correct option is A.

Explanation for correct option:

1. The 23S rRNA gene is found in bacterial ribosomes.
2. It contains catalytic activity for peptidyl transferase, which aids in the creation of peptide bonds during protein synthesis.

Explanation for incorrect option:

Option B:

1. With the exception of mitochondrial ribosomes of fungi and mammals, ribosomal 5S RNA (5S rRNA) is an essential component of the major ribosomal subunit in all known organisms.
2. Protein production should be improved if a ribosome structure is stable.

Option C:

1. Small regulatory RNA (srRNA) is a term that refers to small RNA molecules that operate as direct gene regulators.
2. The majority of srRNAs work by targeting messenger RNA (mRNA) molecules with imperfect base pairing, causing mRNA degradation and/or translation inhibition.

Option D:

1. A processed segment of HnRNA is proposed to operate as an activator of ribosomal gene transcription via base-pair interaction with the ribosomal gene's non-transcribed region.

Final answer: 23S rRNA also acts as a catalyst in a bacterial cell.