Question

If cro were to bind or3 before ci bound or1 and or2, the phage:___. question 6 options:

a. would increase expression of ci.
b. would continue through the lytic pathway.
c. integrate into the host genome and become a prophage dna would be targeted by the exonuclease cii.
d. would enter lysogeny.

Answer 1

The binding of Cro to OR3 before Ci binding to OR1 and OR2 leads the phage to continue its replication through the lytic pathway.

Step-by-step explanation:

If Cro were to bind OR3 before Ci bound OR1 and OR2, the phage would continue through the lytic pathway. During the lytic cycle, the phage replicates its DNA, synthesizes new viral components, and eventually causes lysis of the host cell to release new virions. Conversely, in the lysogenic cycle, the phage DNA is incorporated into the host genome and might get passed on to subsequent generations, ultimately switching to the lytic cycle under environmental stress. Hence, the binding of Cro to OR3 favors the lytic cycle over the lysogenic cycle.