Question

Mention one difference to distinguish an exon from an intron. [Foreign 2016]

Answer 1

Introns

Introns are intervening sequences between two exons found in eukaryotes. They do not directly code for proteins. They are removed before the mRNA forms proteins. Therefore, these introns undergo the process of splicing.  

Introns are the non-coding parts of the nucleotides and are not highly conserved. therefore, it is essential to remove introns to prevent the formation of incorrect proteins.

1.Found in Eukaryotes only.

2.Non-coding areas of the DNA.

3.Even after the mRNA splicing, introns continue to remain in the nucleus.

4.The sequence of the introns changes frequently over time. In other words, they are less conserved

Exons

Exons are the coding sequences that code for amino acid sequence of the protein. The exons are transcribed into mature mRNA after post-transcriptional modification. These are highly conserved sequences, i.e., they do not change frequently with time.

1.Found in both prokaryotes and eukaryotes.

2.Coding areas of the DNA.

3.When mature mRNA is produced, exons move to the cytoplasm from the nucleus.

4.Exons are highly conserved

Answer 2

Answer:

exons are the coding areas where as the non coding areas of the gene