A sestina, or sextain, is a poem comprised of six stanzas containing six lines each. These six-by-six stanzas are followed by a shorter (3-line) final stanza known as an envoi. This gives the sestina a total of 39 lines (6 * 6 + 3 = 39).
1 A nonsense mutation is a point mutation in a sequence of DNA that results in a premature stop codon, or a nonsense codon in the transcribed mRNA, and possibly a truncated, and often nonfunctional protein product.
A three-nucleotide sequence in mRNA that specifies a particular amino acid or polypeptide termination signal; basic unit of the genetic code. In translation, an mRNA codon is â¦ recognized by its complementary tRNA anti-codon. three-nucleotide sequence in mRNA that specifies a particular amino acid or polypeptide termination signal; basic unit of the genetic code. In translation, an mRNA codon is â¦ recognized by its complementary tRNA anti-codon.