BI 107Gene Expression student

BI 107Gene Expression student - Gene Expression Production...

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1/21/2011 1 Gene Expression Biology 107 Dr Potter Gene Expression Production of protein (coded by a gene) Cellular function Characteristic Trait Disease Nucleic Acids DNA contains genetic information RNA expresses genetic information Single-stranded polymer of nucleotides: R ibon ucleic A cid Polymer of nucleotides: phosphate – pentose – nitrogen ring ribose A, C, G and Uracil (U) RNA Molecules Messenger RNA (mRNA) – complementary RNA version of DNA – mRNA contains that genetic information Ribosomal RNA (rRNA) – ribosomes, site of protein synthesis Transfer RNA (tRNA) – bring “correct” amino acids to the ribosome RNA Molecules Most of our DNA does not code for anything no genes 99% of genes code for proteins via mRNA 1% of genes code for rRNA, tRNA (tools for making the protein)
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1/21/2011 2 Gene Expression Two steps: 1) Transcription making complementary mRNA (in nucleus of eukaryotes) 2) Translation using mRNA as instructions for making a specific protein at the ribosome in the cytoplasm Transcription “Activation” of individual genes as necessary to make specific proteins as needed Only uses one of the 2 DNA strands • each strand has a different nucleotide sequence • each strand contains different “genetic info” • only uses “template” strand Transcription RNA polymerase binds to the beginning of
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This note was uploaded on 11/04/2011 for the course BI 107 taught by Professor Fuller during the Spring '08 term at Montgomery College.

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BI 107Gene Expression student - Gene Expression Production...

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