Which Form of RNA Has the Task of Unsticking Stuck

Question

Which form of RNA has the task of unsticking stuck ribosomes?
A) mRNA
B) rRNA
C) sRNA
D) tmRNA
E) tRNA

Accepted Answer

tmRNA (transfer-messenger RNA) has the task of rescuing ribosomes that have stalled during protein synthesis. It acts as a hybrid molecule, combining features of both tRNA and mRNA, and can enter the A-site of the ribosome, transfer the incomplete peptide chain from the tRNA to its own C-terminus, and then act like mRNA to add a short peptide tag to the chain. This allows the ribosome to release the incomplete protein and move on to the next mRNA molecule.