Chapter 17

Chapter 17 - Chapter 17- From Gene to Protein Protein...

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Chapter 17- From Gene to Protein - Protein Synthesis: overview o Beadle and Tatum One- gene- one enzyme hypothesis One- gene- one polypeptide (protein) hypothesis o Transcription Synthesis of RNA under the direction of DNA (mRNA) o Translation Actual synthesis of a polypeptide under the direction of mRNA - The triplet code o The genetic instructions for a polypeptide chain are ‘written’ in the DNA as a series of 3-nucleotide ‘words’ o Triplet codes= codons o Codons- set of 3 bases that are found on mRNA o ‘U’ (uracil) replaces ‘T’ in RNA - Transcription, I o RNA polymerase: Pries DNA apart and hooks RNA nucleotides together from the DNA code o Promoter region on DNA: Where RNA polymerase attaches and where initiation of RNA begins o Terminator region: Sequence that signals the end of transcription o Transcription unit: Stretch of DNA transcribed into an RNA molecule o Initiation: Transcription factors mediate the binding of RNA polymerase to an
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Chapter 17 - Chapter 17- From Gene to Protein Protein...

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