rokaryoticgeneregulation：原核基因表達調(diào)控(存儲版)
【正文】 (RFP) Gene B Gene A Gene D Tomato gene 5180。 Positive Regulation a) In the presence of arabinose: ?CAPcAMP plex and araCarabinose plex bind to initiator region ?this allows RNA polymerase to bind to the promoter ?transcription begins b) In the absence of arabinose: ?araC protein assumes a different conformation ?acts as a repressor ?binds to araI and a second operator region araO ?forms a loop ?this loop prevents transcription Copyright 169。 2022 Pearson Education, Inc. publishing as Benjamin Cummings Repressible and Inducible Operons: Two Types of Negative Gene Regulation ? A repressible operon is one that is usually on。 2022 Pearson Education, Inc. publishing as Benjamin Cummings Anticipatory Questions ? 1. What might happen if an anism had its cells expressing all genes within the genome all the time? ? 2. At what levels can control of cellular activities/pathways be controlled? ? 3. Based on our discussions up to this point, what do you think the term “negative feedback” means? ? 4. What steps are involved in the initiation of prokaryotic transcription? Copyright 169。 2022 Pearson Education, Inc. publishing as Benjamin Cummings Lac Operon Animation content/ Copyright 169。 3180。 2022 Pearson Education, Inc. publishing as Benjamin Cummings The Arabinose Operon A Composite of Negative amp。 2022 Pearson Education, In
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