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Published byJune Hancock Modified over 8 years ago
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The Functions of DNA
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2. Protein synthesis “Central dogma” (main idea) of molecular biology: DNARNAprotein We already know that proteins do the work to make all your traits, which make you YOU.
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What is RNA? RiboNucleic Acid How is that different from DNA? Ribo- vs. Deoxyribo-
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RNA vs. DNA Single strand Double strand
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RNA vs. DNA con’t. Different sugars
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RNA vs. DNA con’t. Base difference: DNA: thymine RNA: uracil (U)
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What is the function of RNA? To carry the genetic message from the nucleus to where it will be used in the cytoplasm
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Protein Synthesis Part I: Transcription DNARNAprotein
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Transcription 1.A gene on the DNA molecule unwinds and unzips
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Transcription 2. RNA bases are matched to unraveling DNA strand, using RNA polymerase
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Transcription 3. RNA strand (called messenger RNA or mRNA) detaches from DNA and leaves nucleus to travel into cytoplasm
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http://www.stolaf.edu/people/giannini/flashan imat/molgenetics/transcription.swf
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Why is transcription necessary? DNA is double stranded and too big to leave nucleus through pores DNA is the all-important master template and must stay protected. RNA is disposable
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Practice transcription TAC GAA CGA GTG AUG CUU GCU CAC
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