No lactose in the cell The repressor binds to operator, blocking transcription. lacY (permease) lacA lacZ (B-galactosidase) (transacetylase) DNA Terminator RNA polymerase bound to promoter to operator Repressor bound Lactose present in the cell Some lactose is converted to allolactose. This binds to the repressor and alters its shape, so that it can no longer bind to the operator. If glucose is not available, the operon will be transcribed. Transcription Transcription O FIGURE 7.23 Lactose and the lac Operon B-Galactosidease is the enzyme that hydrolyzes lactose into its monosaccharide components. Allolactose Non-functional repressor Permease is the transporter that brings Translation lactose into the cell. The function of transacetylase in lactose catabolism is not fully understood. ? When would the lac operon in E. coli be repressed, and why?

No lactose in the cell The repressor binds to operator, blocking transcription. lacY (permease) lacA lacZ (B-galactosidase) (transacetylase) DNA Terminator RNA polymerase bound to promoter to operator Repressor bound Lactose present in the cell Some lactose is converted to allolactose. This binds to the repressor and alters its shape, so that it can no longer bind to the operator. If glucose is not available, the operon will be transcribed. Transcription Transcription O FIGURE 7.23 Lactose and the lac Operon B-Galactosidease is the enzyme that hydrolyzes lactose into its monosaccharide components. Allolactose Non-functional repressor Permease is the transporter that brings Translation lactose into the cell. The function of transacetylase in lactose catabolism is not fully understood. ? When would the lac operon in E. coli be repressed, and why?

Name: When would the lac operon in E. coli be repressed, and why? No lactose
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Description: When would the lac operon in E. coli be repressed, and why? No lactose in the cellThe repressor binds to operator, blocking transcription.lacY(permease)lacAlacZ(B-galactosidase)(transacetylase)DNATerminatorRNA polymerasebound to promoter to operatorR

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter16: Regulation Of Gene Expression

Section: Chapter Questions

Problem 6TYK

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