MCAT DNA Replication Explained: Semi-Conservative Copying, Okazaki Fragments, & Mutation Repair
In this episode we connect genetics + central dogma to the next big step: how cells copy DNA and what happens when it goes wrong.What you’ll learn (MCAT-high yield):Semi-conservative replication: why each daughter DNA has one old + one new strandOrigins of replication & replication bubblesKey enzymes: helicase, SSB proteins, topoisomerase, DNA pol III & I, primase, ligaseLeading vs. lagging strands and Okazaki fragmentsProofreading & repair: exonuclease activity, mismatch repair, nucleotide excision repair (UV/thymine dimers)Mutation types: silent, nonsense, frameshift (+ why location matters)Where this shows up in cell cycle, cancer biology, and classic experimental set-ups (knockouts)Perfect for MCAT Bio/Biochem passages that love replication, mutations, and repair pathways.Want to learn more? Shoot us a text at 415-855-4435 or email us at
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