GENETICS AND EVOLUTION
MOLECULAR BASIS OF INHERITANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Inducer-Lactose
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Lac z-codes for repressor protein
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Presence of glucose-Switches off the lac operon
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Repressor protein-Negative control of lac operon
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Detailed explanation-1: -The inducer is a molecule that binds to the repressor and causes conformational changes in repressor which in turn can no longer bind to the operator. Thus inducer induces the expression of the structural gene. Thus, the correct answer is option C.
Detailed explanation-2: -The lacZ gene encodes -galactosidase, which degrades lactose.
Detailed explanation-3: -The Z gene codes for -galactosidase, which is primarily responsible for the hydrolysis of the disaccharide lactose into its monomeric units, galactose and glucose.
Detailed explanation-4: -The lac operon encodes genes that needs to acquire and process the lactose from the local environment. These are of different types-I, P, O, lac Z, lac Y and lac A. Of these lac I gene codes for repressor protein.