HSCI 100 Lecture Notes - Cytosine, Start Codon, Uracil

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Dna: has a double helix that is held together by hydrogen bonds, adenine pairs with thymine, cytosine pairs with guanine, gene expression: dna rna protein. Rna synthesis: single stranded molecule, nucleotide uracil pairs with adenine, function in cytoplasm, the 1st step in converting dna message to a protein is to copy the message as rna, by a process called transcription. > transcription occurs inside the nucleus: has 3 types of rna. Carries dna information in the sequence of its bases (codons ) from nucleus to the cytoplasm. Binds to a specific amino acid and transports it to be added, as appropriate, ti a growing polypeptide chain. Combines with protein to form ribosome (structures on which polypeptides are synthesized) 2 main steps of gene expression: transcription: by rna polymerase, specific regions of dna unwinds and be copied, done by enzymes, rna nucleotides pair with the complementary. Dna bases and are linked together to form an.

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