Which statement about messenger RNA is correct?
1 )
In eukaryotic cells, mRNA is made by removing exons from the primary RNA transcript.
2 )
mRNA is a single-stranded polynucleotide containing a different purine base than DNA.
mRNA molecules contain ribose sugars joined to phosphate groups by phosphodiester bonds.
4 )
The monomers of mRNA contain a phosphate group, deoxyribose sugar and a nitrogenous base.
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