For the following E. coli merodiploids lactose is present in the culture media. Use "YES" to indicate if lactose is utilized and "NO" if it is not. Explain why or why not for each.
chromosome/plasmid
a) I+ P- Oc Z+ Y+ A+/ I- P+ Oc Z+ Y- A+
b) I- P+ O+ Z+ Y- A+/ Is P+ Oc Z- Y+ A+