BYS201_Gene_circuits - BYS201GeneCircuits TRANSCRIPTION DNA...

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BYS201 Gene Circuits Flow of information in gene expression from genes in the form  of DNA to mRNA by transcription and from mRNA to proteins  in the form of translation. TRANSLATION TRANSCRIPTION TRANSCRIPTION RNA PROCESSING TRANSLATION DNA mRNA mRNA DNA Pre-mRNA Ribosome Polypeptide Polypeptide Ribosome Nuclear envelope Prokaryotic cell. In a cell lacking a nucleus, mRNA produced by transcription is immediately translated into proteins without additional processing. (a) Eukaryotic cell. The nucleus provides a separate compartment for transcription. The original RNA transcript, called pre-mRNA, is processed in various ways before leaving the nucleus as mRNA. (b)
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DNA molecule Gene 1 Gene 2 Gene 3 DNA strand (template) TRANSCRIPTION mRNA Protein TRANSLATION Amino acid A C C A A A C C G A G T U G G U U U G G C U C A Trp Phe Gly Ser Codon 3 5 3 5 Genes not only contains information for protein but also regulatory  sequences that control  when  and  where  to express the gene and  how  much . Regulatory sequences are analogous to electrical circuits as they  process multiple input signals to process output in a very brief time.
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Gene to Protein :   The rules of DNA base pairing allows for sequence of bases  on one strand to determine the sequence of the other strand. “Genes are units of genetic information stored in the sequences of DNA”.
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This note was uploaded on 11/07/2011 for the course BYS 201 taught by Professor Podila during the Spring '09 term at University of Alabama - Huntsville.

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BYS201_Gene_circuits - BYS201GeneCircuits TRANSCRIPTION DNA...

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