Chapter 13-pt1

Chapter 13-pt1 - Chapter 13 (pg 331-336) Gene Expression...

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Chapter 13 (pg 331-336) Gene Expression – The Central Dogma: An Overview DMA RNA protein (transcription translation) Transcription – synthesis of a single-stranded RNA copy of a segment of DNA Types of RNA mRNA – encode aa sequence of a polypeptide; transcripts of protein-coding genes (aka structural genes) rRNA – together w/ ribosomal proteins, make up ribosome (which translates mRNA to protein) tRNA – brings aa to ribosomes during translation snRNA (small nuclear) – together w/ proteins, form complexes that are used in eukaryotic RNA processing Transcription Process RNA synthesis gene regulatory elements – sequences associated w/ each gene; regulate transcription RNA Pol – catalyzes transcription selects NTP to be added to the chain by its ability to pair w/ exposed base on DNA template strand don’t need primers synthesizes in 5’ 3’ direction (reads DNA from 3’ 5’) DNA double helix unwinds for a short region next to gene prokaryotes – unwound by RNA pol eukaryotes – unwound by other proteins at start point for
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Chapter 13-pt1 - Chapter 13 (pg 331-336) Gene Expression...

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