A protein synthesis inhibitor that catalytically inactivates 28S rRNA and is very toxic in eukaryotic cells is:

Question

Quizplus · Accepted Answer

Only ricin is known to catalytically inactivate 28S rRNA and it is very toxic in eukaryotic cells. Puromycin inhibits protein synthesis by prematurely terminating elongation, cycloheximide inhibits elongation by blocking peptidyl transferase activity, streptomycin inhibits initiation by binding to the 16S rRNA of the bacterial ribosome, and tetracycline inhibits elongation by blocking the A site.

A Protein Synthesis Inhibitor That Catalytically Inactivates 28S RRNA and Is