Question

The enzyme that links the 5'-CAP structure through a 5'-to5' triphosphate linkage to the ends of RNA transcripts is called:

A. Poly A polymerase
B. methyltransferase
C. RNA methylase
D. peptidyltransferase
E. guanyltransferase

Answer 1

The enzyme that links the 5'-CAP structure through a 5'-to5' triphosphate linkage to the ends of RNA transcripts is guanyltransferase.

Step-by-step explanation:

The enzyme that links the 5'-CAP structure through a 5'-to5' triphosphate linkage to the ends of RNA transcripts is E. guanyltransferase.

The 5'-CAP structure is a methyl guanosine cap added to the 5' end of the mRNA. This cap helps mRNAs leave the nucleus and associate with ribosomes. The guanyltransferase enzyme is responsible for placing the methylated guanosine residue at the 5'-end of the mature mRNA.

Overall, the 5'-CAP structure serves to protect the mRNA from degradation, assists in mRNA export from the nucleus, and plays a role in initiating translation by ribosomes.