BIO Chapter 14

BIO Chapter 14 - From DNA to RNA Overview of Transcription...

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Sheet1 Page 1 From DNA to RNA Overview of Transcription The Central Dogma -All organisms use the same basic pathway to make proteins -It is called the *central dogma of biology* ->DNA -> RNA -> Protein -This is also called *gene expression* What is it? -The process of the transfer of information from DNA to RNA is called *transcription* ->THe information is transcribed or rewritten by *RNA Polymerase* -->Polymerase: Makes RNA -It is the mRNA that carries the message to the ribosomes Types of RNA -There are three kinds of RNA ->*Ribosomal RNA (rRNA)* ->These are found in ribosomes -*Transfer RNA (tRNA)* ->Thse transfer amino acids to the ribosome ->There are about 45 different kinds of tRNA -*Messenger RNA (mRNA)* ->These contain the code, derived from DNA, that dtermine the amino acid sequence of a protein RNA Polymerase -*Transcription* is the process of making an RNA copy of the DNA sequence -THis is the first step in *Gene expression* -This is carried out by *RNA Polymerase* -Unlike DNA Polymerase, RNA Polymerase does not need a primer Two strands -Since DNA is a duplex, only one strand serves as a template (*the template, or antisense (-), strand*) while the other strand i s Transcription in prokaryotes Promoters -Transcription begins at specific sequences on the DNA template called *promoters* -These serve as RNA pol binding sites -There are two unique sequences in the promoter
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This note was uploaded on 05/06/2008 for the course BIOL 121 taught by Professor Lopez during the Fall '07 term at Lansing.

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BIO Chapter 14 - From DNA to RNA Overview of Transcription...

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