Question

Which of the following is not true about archaeal ribosomes? Multiple Choice
A) They may possess ribosome binding sites homologous to bacterial Shine-Dalgarno sequences.
B) They are 70S like bacterial ribosomes.
C) They have similar antibiotic sensitivities to those of bacteria.
D) All of these are true about archaeal ribosomes.

Answer 1

Answer:

C) They have similar antibiotic sensitivities to those of bacteria.

Explanation:

• Ribosomes are the site for biological protein synthesis that is composed of macromolecular machine for protein synthesis.
• In archaea they ribosomes comprise of three RNA molecules - 16S, 23S, and 5S.
• The archaeal ribosome is a 70S ribosome that is composed of 50S and 30 S subunits.
• The ribosomal binding site of archaeol ribosome may be similar to that of the bacteria, i.e. the Shine- Dalgarno sequence.
• However, the antibiotic sensitivity of the archaeal ribosome is different than those of bacteria as the r-protein sequence of the archaea are closer to that of eukaryote than the bacteria.