Ch13_Lecture

Ch13_Lecture - 13 Gene Expression in Prokaryotes 13 The...

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13 Gene Expression in Prokaryotes
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13 The Genetics of Viruses and Prokaryotes 13.1 How Do Viruses Reproduce and Transmit Genes? 13.2 How Is Gene Expression Regulated in Viruses? 13.3 How Do Prokaryotes Exchange Genes? 13.4 How Is Gene Expression Regulated in Prokaryotes? 13.5 What Have We Learned from the Sequencing of Prokaryotic Genomes?
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13.3 How Do Prokaryotes Exchange Genes? Prokaryotes (Bacteria and Archaea) are living cells. Reproduction is usually asexual. A single cell divides into two identical cells— clones . Single cells can be isolated and grown into clones as pure cultures.
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13.3 How Do Prokaryotes Exchange Genes? Many bacteria have an extra small, circular chromosome called a plasmid . Plasmid s have a few dozen genes, plus an origin ( ori ). Often replicate at the same time as main chromosome , but not always.
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13.3 How Do Prokaryotes Exchange Genes? Plasmid s exist independently of the main chromosome . Can be transferred during conjugation. Plasmid s don’t need to recombine with the main chromosome .
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Figure 13.14 Gene Transfer by Plasmid s
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13.3 How Do Prokaryotes Exchange Genes? Many plasmid s have special genes. Metabolic factors are plasmid s with genes for unusual metabolic functions such as breaking down hydrocarbons. Fertility factors ( F factors ) have genes needed for conjugation. F factor can be transferred during conjugation.
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This note was uploaded on 05/10/2008 for the course BIOL 120 taught by Professor Hasek during the Spring '08 term at LSU.

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Ch13_Lecture - 13 Gene Expression in Prokaryotes 13 The...

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