Question

Mature mRNA from a eukaryote would contain each of these features except which of the following?

a) 5’ cap
b) 3’ poly-A tail
c) Intron sequences
d) Exon sequences

Answer 1

Mature mRNA in eukaryotes does not contain intron sequences as they are removed during splicing, leaving only exons in the final mRNA along with a 5' cap and a 3' poly-A tail.

Step-by-step explanation:

The feature that mature mRNA from a eukaryote would not contain is c) Intron sequences. In eukaryotic cells, during mRNA processing, intron sequences are removed through a process called splicing. This allows only exon sequences, which code for proteins, to be part of the mature mRNA. Furthermore, mature eukaryotic mRNA contains a 5' cap and a 3' poly-A tail both of which play crucial roles in protecting the mRNA from degradation and aiding in its export from the nucleus.