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

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Viral Replication

The virus is acellular and considered non-living outside the host cell. The replication of the virus occurs only inside the living cells. Only a few genes are present in the smallest virus, whereas many genes are present in the largest virus. These genes encode specific viral proteins.