Introns

Introns are segments of a gene situated between exons that are not translated. The term intron refers not only to the DNA sequence within a gene but also to the corresponding sequence in RNA transcripts. Introns are present in the genes of most eukaryotic organisms and many virus and their number, length, location and composition greatly varies among genes. They are removed from the pre-mRNA sequence during RNA splicing, resulting in a mRNA sequence ready to be translated. Alternative splicing of introns introduces greater variability of protein sequences translated from a single gene, allowing the translation of far more proteins than the actual amount of genes present in the genome.

Bioquímica (Grupo 9)

Alexandra Gonçalves       67330

Manuela Proença             67340

Sara Ribeiro                     67336

Telma Afonso                   67377