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.
The Proportion of the DNA That Codes for Genes. 12 Introns and Exons â¢ Portions of the mRNA are removed before translation. Mutations â¢ Point Mutation â change in a single nucleotide of the DNA sequence. â¢ Insertions and Deletions â changes one or more nucleotides in the DNA sequence.he Proportion of the DNA That Codes for Genes. 12 Introns and Exons â¢ Portions of the mRNA are removed before translation. Mutations â¢ Point Mutation â change in a single nucleotide of the DNA sequence. â¢ Insertions and Deletions â changes one or more nucleotides in the DNA sequence.