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Chapter 7 - Chapter 5 6 DNA chromosomes maintenance of...

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1 Chapter 5 & 6: DNA, chromosomes & maintenance of hereditary material Chapter 7 & 8: Central dogma & regulation of gene expression • allows flexible regulation of expression • alter copy number of mRNA and/or protein levels • regulation costs energy; but this is NOT wasteful RNA intermediate: wasteful? no.
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2 RNA is almost the same as DNA: RNA • is single stranded but still can base pair with self • form 3-D structures - hair pins, stem loops etc • 3-D structure is most often critical to function (e.g. tRNA)
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