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https://www.khanacademy.org/science/ap-biology/gene-expression-and-regulation/transcription-and-rna-...
Introduction to transcription including the role of RNA polymerase, promoters, terminators, introns and exons.
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https://www.khanacademy.org/test-prep/mcat/biomolecules/dna/v/leading-and-lagging-strands-in-dna-rep...
MCAT on Khan Academy: Go ahead and practice some passage-based questions!
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