74.In an E.coli strain i gene gets mutated and it’s product can not bind the inducer molecule. If growth medium is provided with lactose, what will be the outcome? A. z, y, a genes will be transcribed B. z, y, a genes will not be translated C. RNA polymerase will bind the promoter region D. Only z gene will get transcribed
Option B The Z gene in the structural genes of the lactose operon codes for Beta-galactosidase. A mutation in the Z-gene causes inability in the synthesis of beta-galactosidase. Hence, lactose cannot be broken down into glucose and galactose. So, the correct answer is 'They cannot synthesize functional beta-galactosidase'
