Question

Review Each temperate (or lysogenic) bacteriophage (e.g., lambda, 434, P22) encodes its own repressor protein. The repressor binds to six binding sites within the phage genome. These sites can also be bound by a second transcriptional repressor encoded by the phage, called Cro. The pattern of binding of repressor and Cro to these sites determines whether the phage grows lytically or lysogenicaly. Launch the molecular model of the temperate bacteriophage repressor to explore its structure. Then, answer the questions. Launch molecular model

Answer 1

Part A: (d) In the lysogenic cycle, repressor protein is produced , preventing the expression of CRO and gene for viral replication. In the lytic cycle, CRO protein is produced, preventing the expression of repressor protein; genral for viral reputation are expressed

Part B: (b) A/T-C/G-A/T-A/T serves as key recognition sequence for repressor binding.

Part C: (d) the repressor is a dimer that binds in the major groove of DNA.