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.
5. What is the difference between a missense mutation and a nonsense mutation? Point mutations can be classified as a base substitution or an insertion/deletion but they are also classified on whether the change produces a premature stop in the gene.Nonsense mutations are mutations that result in a premature stop.. What is the difference between a missense mutation and a nonsense mutation? Point mutations can be classified as a base substitution or an insertion/deletion but they are also classified on whether the change produces a premature stop in the gene.