Chapter 12, Problem 17P

Identify which of the following lac operon haploid genotypes transcribe operon genes induciblyand which transcribe genes constitutively. Indicate whether the strain is ${\text{lac}}^{+}$(able to grow on lactose $\text{-}$ only medium) or ${\text{lac}}^{\text{-}}$(cannot grow on lactose medium).

a. ${\text{I}}^{\text{+}}{\text{P}}^{\text{+}}{\text{O}}^{\text{+}}{\text{Z}}^{\text{+}}{\text{Y}}^{\text{-}}$

b. ${\text{I}}^{\text{+}}{\text{P}}^{\text{+}}{\text{O}}^{\text{C}}{\text{Z}}^{\text{-}}{\text{Y}}^{\text{+}}$

c. ${\text{I}}^{\text{-}}{\text{P}}^{\text{+}}{\text{O}}^{\text{+}}{\text{Z}}^{\text{+}}{\text{Y}}^{\text{+}}$

d. ${\text{I}}^{\text{+}}{\text{P}}^{\text{-}}{\text{O}}^{\text{+}}{\text{Z}}^{\text{+}}{\text{Y}}^{\text{+}}$

e. ${\text{I}}^{\text{+}}{\text{P}}^{\text{+}}{\text{O}}^{\text{+}}{\text{Z}}^{\text{-}}{\text{Y}}^{\text{+}}$

f. ${\text{I}}^{\text{+}}{\text{P}}^{\text{+}}{\text{O}}^{\text{C}}{\text{Z}}^{\text{+}}{\text{Y}}^{\text{-}}$

g. ${\text{I}}^{\text{+}}{\text{P}}^{\text{+}}{\text{O}}^{\text{C}}{\text{Z}}^{\text{+}}{\text{Y}}^{\text{+}}$