a Induction Repressor- Inducer helps turn transcription on. Transcription normally off. Inducer Repressor Operator RNA polymerase bound to promoter Transcription Transcription blocked The repressor binds to the operator, blocking transcription. Inducer binds to the repressor and alters its shape, so that it can no longer bind to the operator. The DNA is open for transcription. b Repression Repressor- Corepressor Repressor Corepressor helps turn transcription off. Transcription normally on. Operator RNA polymerase bound to promoter Transcription The repressor alone cannot bind to the operator. The DNA is open for transcription. Transcription blocked The corepressor-repressor complex can bind to the operator, blocking transcription. O FIGURE 7.21 Transcriptional Regulation by Repressors (a) Induction. (b) Repression.

a Induction Repressor- Inducer helps turn transcription on. Transcription normally off. Inducer Repressor Operator RNA polymerase bound to promoter Transcription Transcription blocked The repressor binds to the operator, blocking transcription. Inducer binds to the repressor and alters its shape, so that it can no longer bind to the operator. The DNA is open for transcription. b Repression Repressor- Corepressor Repressor Corepressor helps turn transcription off. Transcription normally on. Operator RNA polymerase bound to promoter Transcription The repressor alone cannot bind to the operator. The DNA is open for transcription. Transcription blocked The corepressor-repressor complex can bind to the operator, blocking transcription. O FIGURE 7.21 Transcriptional Regulation by Repressors (a) Induction. (b) Repression.

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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