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RNA and protein synthesi1

RNA and protein synthesi1 - terminated A critical part of...

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RNA and protein synthesis, the genetic code The genetic code refers to the correspondence between codons and amino acids (Tortora Fig 8.9) - Note that there are 64 possible codons (four bases in possible combinations of three, or 43) to encode twenty amino acids - This means that the genetic code is degenerate in that a given amino acid can be encoded by more than one codon - Where an amino acid is encoded by more than one codon, those codons typically have the first two bases in common - Three of codons are called nonsense codons, and serve as stop codons If the transcribed RNA is a messenger RNA, its nucleotide sequence is used for synthesis of a protein by the process of translation (Tortora Fig 8.10) - In bacteria, translation of an mRNA may begin before transcription has been
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Unformatted text preview: terminated- A critical part of the translation mechanism is the activation o f specific transfer RNAs with amino acids = For each of the 20 amino acids incorporated into proteins, there are one or more specific transfer RNAs = During activation, an amino acid is covalently attached to its tRNA- Transfer RNAs serve as the link between the nucleotide sequence of a messenger RNA and the amino acid sequence of a protein = Each set of three nucleotides of an mRNA, called a codon, specifies a single amino acid = Each activated tRNA has, at a specific point, an anticodon sequence that will base pair with the codon specifying the amino acid carried by the tRNA...
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