BIO130H1 Chapter Notes - Chapter 6: Crispr, Non-Coding Rna, Cas9
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BIO130H1 Full Course Notes
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Crispr- non-coding rna in bacteria: within the genome of many bacteria there are genomic loci containing short dna segments that are identical to sequences from the dna of bacteriophage viruses, separated by a repeated dna sequence. If any or all of these 44 triplets code for amino acids, then at least some of the amino acids would be specified by more than one codon. A code of this type is said to be degenerate: three codons have a special punctuation function (recognized as stop codons). The genetic code can still be considered universal (present in all organisms): therefore, all known organisms present on earth today share a common evolutionary origin, the amino acid assignments are distinctly nonrandom. Rna chain, that is, posttranscriptionally: all trnas have sequences of nucleotides in one part of the molecule that are complementary to sequences located in other parts of the molecule.
