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Unformatted text preview: The Central Dogma of Molecular Biology DNA RNA Polypeptide Transcription- the information in a DNA sequence is copied into a complementary RNA sequence Translation- RNA sequence is used to created the amino acid sequence of a polypeptide RNA Usually single- stranded Sugar is ribose Uracil instead of thymine Three types of RNA in protein synthesis o mRNA- messenger o tRNA- transfer o rRNA- ribosomal 14.3- How is the Information Content in DNA Transcribed to Produce RNA? Trascription occurs in three steps Initiation- required a promoter which is a special sequence of DNA to which the RNA polymerase binds very tightly Promoters are important control sequences that tell the RNA polymerase 2 things: o Where to start transcription o Which strand of DNA to transcribe The Genetic Code o Redundant but not ambiguous o Only 1 start codon: AUG aka Methionine o 3 stop codons: UAA, UAG, UGA...
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