Identify the correct statement about "gratuitous inducer" from the options given below:
1
It can bind with promoter region of a gene but cannot facilitate gene expression.
2
Isopropyl thiogalactoside (IPTG) resembles Iactose.
3
It is after the binding of gratuitous inducer with the main inducer molecule a gene can be expressed.
4
It resembles the inducer molecule but has no role in gene expression.