Regulation of Gene Expression and Lac Operon
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BIOXII06: MOLECULAR BASIS OF INHERITANCE

342988 Read the following statements for lac operon:
I. Each operon has its specific operator and specific repressor
II. The y-gene codes for permease, which increases permeability of the cell to -galactoside
III. Regulation of lac operon can be visualised as regulation of enzyme synthesis by its substrate
Select the correct option:

1 All statements are correct
2 All statements are incorrect
3 Only (I) is correct and (II) and (III) are incorrect
4 Only (I) and (III) are correct
BIOXII06: MOLECULAR BASIS OF INHERITANCE

342989 Assertion :
Regulation of lac operon by repressor is referred to as negative regulation.
Reason :
The repressor protein binds to the operator region of the operon.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Both Assertion and Reason are incorrect
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BIOXII06: MOLECULAR BASIS OF INHERITANCE

342988 Read the following statements for lac operon:
I. Each operon has its specific operator and specific repressor
II. The y-gene codes for permease, which increases permeability of the cell to -galactoside
III. Regulation of lac operon can be visualised as regulation of enzyme synthesis by its substrate
Select the correct option:

1 All statements are correct
2 All statements are incorrect
3 Only (I) is correct and (II) and (III) are incorrect
4 Only (I) and (III) are correct
BIOXII06: MOLECULAR BASIS OF INHERITANCE

342989 Assertion :
Regulation of lac operon by repressor is referred to as negative regulation.
Reason :
The repressor protein binds to the operator region of the operon.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Both Assertion and Reason are incorrect
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