Question

Mature eukaryotic mRNA is recognized by

• A. Presence of introns and exons
• B. 7-methyl guanosine at 5’ end and poly(A) tail at 3’ end
• C. TATA box
• D. Shine-Dalgarno sequence

Answer 1

The correct option is B 7-methyl guanosine at 5’ end and poly(A) tail at 3’ end

Nascent mRNA in eukaryotic cell undergoes RNA processing (5’ capping, 3’ polyadenylation followed by intron splicing) before it is sent to the cytoplasm. So mature eukaryotic mRNA is recognized by 7- methyl guanosine at the 5’ end and poly(A) tail at the 3’ end and only exons are present in it.
TATA box is a consensus sequence present in the core promoter of both prokaryotes and eukaryotes located at -30. In prokaryotes, it is known as the Pribnow box and in eukaryotes, it is known as the Goldberg-Hogness box.
Shine-Dalgarno sequence is a consensus sequence found in bacterial mRNA located upstream of the translation start point. It helps in the assembly of ribosomes.