Chapter 7 Slide

Chapter 7 Slide - BIO 205 Chapter 7 Prokaryotic Genetics...

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BIO 205 Chapter 7
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Prokaryotic Genetics
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The Four Nucleotides Composing DNA
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DNA Base Pairs
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Double Stranded DNA Molecule
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Prokaryotic DNA Prokaryotic DNA Is Organized within the Nucleoid: Most of the genetic information in prokaryotic cells is contained in the chromosome. The chromosome is located in the nucleoid. DNA within a Chromosome Is Highly Compacted. DNA occupies around 1/3 of the total volume of the cell.
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Prokaryotic DNA Continued The chromosome is supercoiled – twisted and tightly packed by nucleoid-associated proteins
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Many Prokaryotic Cells also Contain Plasmids. Plasmids are stable extrachromosomal DNA elements that carry nonessential genetic information They replicate independently from the chromosome F plasmids allow genetic material to be transferred from a donor cell to a recipient R plasmids carry genes for antibiotic resistance Plasmids
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DNA Replication DNA Replication Is a Highly Regulated Process The first stage of prokaryotic replication is initiation , where DNA unwinds and the strands separate. The point where replication starts is the origin of replication ( ori C) As the DNA unzips, two replication forks form and move in opposite directions away from the origin
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The second stage is elongation , when enzymes synthesize a new strand to pair with each original strand.
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This note was uploaded on 04/17/2009 for the course MIC 201 taught by Professor Lacroix during the Spring '08 term at Rhode Island.

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Chapter 7 Slide - BIO 205 Chapter 7 Prokaryotic Genetics...

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