OR3 OR2 ORI Рам Pa During the lysogenic cycle, the a repressor controls the switch. During the lytic cycle, the cro protein controls the switch. cro proteln binds to Oga- The a repressor binds to OR FA repressor cro proteln OR OR3 On2 PR ORI Og3 Or2 PR PaM Off The A repressor binds to Orz and then to Og3 cro proteln binds to OR2 and Our OR3 OR2 ORI Ora Orz ORI PeM The amount of the a repressor falls, because cll Is not activating P The a repressor Is released from Og3- Lytic cycle occurs Рам FIGURE 18.11 The Og operator, the genetic switch bet ween the lysogen ic and lytic cycles. Lysogenic cycle occurs CONCEPT CHECK: What environmental conditions favor a switch to the lytic cycl in in

OR3 OR2 ORI Рам Pa During the lysogenic cycle, the a repressor controls the switch. During the lytic cycle, the cro protein controls the switch. cro proteln binds to Oga- The a repressor binds to OR FA repressor cro proteln OR OR3 On2 PR ORI Og3 Or2 PR PaM Off The A repressor binds to Orz and then to Og3 cro proteln binds to OR2 and Our OR3 OR2 ORI Ora Orz ORI PeM The amount of the a repressor falls, because cll Is not activating P The a repressor Is released from Og3- Lytic cycle occurs Рам FIGURE 18.11 The Og operator, the genetic switch bet ween the lysogen ic and lytic cycles. Lysogenic cycle occurs CONCEPT CHECK: What environmental conditions favor a switch to the lytic cycl in in

Name: As shown a genetic switch that controls the choicebetween the lytic an
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Description: As shown a genetic switch that controls the choicebetween the lytic and lysogenic cycles of phage λ. What is agenetic switch? Compare the roles of a genetic switch and a simpleoperator site (like the one found in the lac operon) in generegulation. OR

Biology Today and Tomorrow without Physiology (MindTap Course List)

5th Edition

ISBN:9781305117396

Author:Cecie Starr, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Christine Evers, Lisa Starr

Chapter7: Gene Expression And Control

Section: Chapter Questions

Problem 15SQ

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