IB 103 Lecture Notes - Lecture 3: Uracil, Thymine, Nucleic Acid Double Helix
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13 Feb 2013
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Be able to draw structure of dna. Dna replication is cells making copy of dna. Semi-conservativve ; each daughter cell gets identical copy of dna: enzyme comes with help of protein and pulls dna apart to separate 2 strands and breaks hydrogen bonds, the pulled strands are old strands. Enzyme comes and adds new bases new strand : each molecule is half old and half new so semi conservative, dna polymerase is the enzyme which does all this. 5. dna polymerase makes polymers (long strands) of dna. Mutation: when dna polymerase inserts the wrong base. Quality control commity looks at if right base is put and corrects it. Correction mechanism is not perfect, so it allows variation to continue: variation is essential. How proteins are synthesized: transcription: making a copy of dna in form of rna; comes out of nucleus and into cytoplasm; rna has bases too, translation: rna is translated to make protein; (dna remains intact)
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