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Processing of the mRNA begins before transcription of eukaryotic mRNA's is complete. The end of the mRNA is prepared
for recognition by the ribosomes of the cell and protected from exonuclease degradation by a process called "capping."
During this multi-step process a nucleoside is added to the end of the mRNA and then modified. Complete the statements
about the capping process.
Capping occurs at the
end of the mRNA.
The nucleoside added is
The nucleoside is connected to the mRNA through a
linkage.
The added nucleoside is modified by methylation at
atom.
The mRNA is modified by methylation of ribose residues at the
-hydroxy position
Answer Bank
P
ine
cytidine
phosphate
diphosphate
uridine
an oxygen
a nitrogen
adenosine
triphosphate

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Jenirelle

Answer:

  • Capping occurs at the  5′ end of the mRNA.
  • Added to the nucleoside is  guanosine
  • The nucleoside is connected to the mRNA through a  5′ to 5′ triphosphate linkage.
  • The added nucleoside is modified by methylation at   the 7th position atom.
  • The mRNA is modified by methylation of ribose residues at the  2′ -hydroxy position

Explanation:

DNA sequences make up genes found on chromosomes; these may have various forms termed alleles. DNA is transcribed into mRNA and then converted into amino acids that are fused together by rRNA to form proteins. In eukaryotes, before translation, mRNA undergoes modifications called capping at the 5' end and poly A tail. This typically has a protective function, preventing the activity of other enzymes like nucleases.

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