Chapter 9 Notes

Chapter 9 Notes - Chapter 9 Notes March 18, 2008 How is DNA...

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Chapter 9 Notes March 18, 2008 How is DNA information used? o Genes (short stretches of DNA) contain instructions for how to make a protein o The instructions are written in a genetic code The genetic code is a language of three-letter words. The letters are specific bases of DNA. Each three letter word specifies a particular amino acid Going from the DNA sequence to a specific protein is a 2step process o Using DNA as the guide, RNA is made in the nucleus during a process called transcription o RNA moves out of the nucleus into the cytoplasm, where it directs the synthesis of proteins RNA o Single stranded o RNA uses the base Uracil (U) instead of Thymine (T) Transcription o The transcribing of a gene into a translatable message that is then carried out of the nucleus o DNA RNA Initiation o Transcription begins when the enzyme RNA polymerase binds to a specific sequence of DNA called a promoter o The promoter… Shows the RNA polymerase where to begin transcription Determines which of the two DNA strands is used as the template for transcription Elongation o Once RNA polymerase is bound to the unwound DNA molecule, it catalyzes the pairing of free nucleotides to the DNA template as follows:
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This note was uploaded on 04/21/2008 for the course BIO 101 taught by Professor Bitch(ifyougotomeredithyouknowwhoi'mtalkingabout) during the Spring '08 term at Meredith.

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Chapter 9 Notes - Chapter 9 Notes March 18, 2008 How is DNA...

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