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9.1 Transcription. Central Dogma DNARNAPROTEIN TranscriptionTranslation.

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Presentation on theme: "9.1 Transcription. Central Dogma DNARNAPROTEIN TranscriptionTranslation."— Presentation transcript:

1 9.1 Transcription

2 Central Dogma DNARNAPROTEIN TranscriptionTranslation

3 Genes  DNA consists of genes  Each gene has a specific sequence (order) of nucleotides  The order of nucleotides determines what protein is made

4 Proteins  Monomer : amino acids  The order of nucleotides in DNA determines the order that amino acids are bonded together to make a protein  Order of amino acids determines function of protein  Different order of a.a.different protein

5 RNA Structure  Monomer: Nucleotides  Bases:  Adenine, guanine, cytosine, uracil  Sugar:  Ribose  Sugar-phosphate backbone  Single-stranded

6 RNA Types  rRNA  Ribosomal RNA  Used to make ribosomes  mRNA  Messenger RNA  Made during transcription in nucleus  tRNA  Transfer RNA  Brings new amino acids to growing protein during translation  In cytoplasm

7 Transcription  Location : nucleus  Goal:  Make a temporary mRNA strand complementary to one gene  Remember: complementary bases DNARNA A T C G

8 Transcription 1. RNA Polymerase (enzyme) unzips a part of DNA  Separates DNA strands of one gene ONLY 2. RNA polymerase  Adds complementary RNA nucleotides to one template DNA strand (strand used to make mRNA)




12 Transcription 3. RNA nucleotides bond together  Create a RNA sugar-phosphate backbone  mRNA strand is finished! 4. mRNA leaves nucleus, DNA rezips & stays in the nucleus

13 Transcription

14 You try it  Given the following DNA code, make the complementary mRNA strand DNA Template: T A C T T A C G A A C G G T A mRNA strand: AUGAAUGCUUGCCAU

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