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Bacterial Structure - for E coli Bacteria have flagella...

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Bacterial Structure The operon model of prokaryotic gene regulation was proposed by Fancois Jacob and Jacques Monod. Groups of genes coding for related proteins are arranged in units known as operons, as illustrated by Figure 5. An operon consists of an operator, promoter, regulator, and structural genes. The regulator gene codes for a repressor protein that binds to the operator, obstructing the promoter (thus, transcription) of the structural genes. The regulator does not have to be adjacent to other genes in the operon. If the repressor protein is removed, transcription may occur. Operons are either inducible or repressible according to the control mechanism. Seventy-five different operons controlling 250 structural genes have been identified
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Unformatted text preview: for E. coli . Bacteria have flagella, shown in Figure 6, although the bacterial flagellum has a different microtubule structure than the flagella of eukaryotes. Cell walls of bacteria contain the peptidoglycan instead of the cellulose found in cell walls of plants and some algae. Ribosomes are the structures in cells where proteins are assembled. Bacterial ribosomes have different sized ribosomal subunits than do eukaryotes. Bacteria typically have one of three shapes: rods (bacilli), spheres (cocci) or spiral (spirilla). These shaps are shown in Figures 7 and 8. Unicellular, they often stick together forming clumps or filaments....
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