Chapter 4 Part 2

Chapter 4 Part 2 - Transcription and Translation 9/17 Why...

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Transcription and Translation 9/17 Why does DNA take a double helical orientation? How is an mRNA sequence translated to produce a specific sequence of specific amino acids? What happens if mutations occur during semiconservative DNA replication? Why are ribosomes important for translation? Could you describe all steps and organelles that permit the gene on DNA for insulin to become a protein called insulin that leaves a cell.
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Don’t Forget: DNA forms a double helix because the two base types on the two sides can hydrogen bond to each other! The helix forms in “antiparallel” orientation. The presence of uracil in RNA prevents a helix from forming in RNA.
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Semiconservative replication means that each strand of the original pair is used to make a new strand. “Semi” means the new cell has half the original strands and half “new” strands.
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Semiconservative replication also means that a mistake (mutation) in the original is passed on to all further replications of the original DNA sequence. Consider This: It is possible that one or two of the original stands of DNA from your mom or dad could still exist in your body! (semiconservative DNA replication) Math: mom 23chromosomes (23dsDNA) 46ssDNA Dad 23 chromosomes (23ds DNA)—46ssDNA You: sum of several trillion cells with 92 original strands still possible floating around unchanged since inception! Fatal mutations can kill a cell immediately and end the cell genetic contribution of the cell to the body. Deleterious mutations to DNA can change the proteins produced by
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This note was uploaded on 04/17/2008 for the course BIOL 211 taught by Professor Wilson during the Fall '07 term at Winona.

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Chapter 4 Part 2 - Transcription and Translation 9/17 Why...

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