$\text{Statement for Linked Answer Questions 52 and 53:}$
An E $coli$ cell of volume $10^{-12}$ $cm^3$ contains 60 molecules of lac-repressor. The repressor has a binding affinity (${K_d}$) of $10^{-8}$ M and $10^{-9}$ M with and without lactose respectively, in the medium
The molar concentration of the repressor in the cell 15
- $\text{0.1 nM}$
- $\text{1 nM}$
- $\text{10 nM}$
- $\text{100 nM}$