# GATE2012-52

$\text{Statement for Linked Answer Questions 52 and 53:}$

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

1. $\text{0.1 nM}$
2. $\text{1 nM}$
3. $\text{10 nM}$
4. $\text{100 nM}$
in Others
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