In Lac operon , the real inducer is
(A)lactose
(B)allolactose
(C)glucose
(D) Beta-galactosidase

Concept Questions :-

Gene Regulation:Lac Operon
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.In lac operon, repressor is inactivated by
(A)interaction with enzyme
(B)interaction with protein
(C)interaction with carbohydrate
(D)interaction with nucleic acid

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.How long the lac operon would be expressed in the presence of lactose?
(A) When glucose is more than lactose concentration
(B) As long as lactose is more than galactose concentration
(C) As long as lactose is more than glucose concentration
(D) when lactose equals glucose concentration

Concept Questions :-

Gene Regulation:Lac Operon
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Lac operon is an example of
(A) both positive and negative regulation
(B)only negative regulation
(C)only positive regulation
(D)sometimes positive sometimes negative

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Lac operon inhibition by repressor is an example of
(A) negative regulation
(B)positive regulation
(C)neither positive nor negative
(D) both positive and negative regulation

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Regulation of lac operon can be visualised as regulation of enzyme synthesis by its
(A) substrate
(B)lactose
(C)carbohydrates
(D)All of these

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Lac operon will be switched on when
(A) lactose is less in the medium
(B)glucose is enough in the medium
(C)lactose is less than glucose
(D)lactose is more than glucose

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Repressor mRNA will be formed in
(A) absence of inducer
(B)presence of inducer
(C)both A and B
(D)presence of lac mRNA

Concept Questions :-

Gene Regulation:Lac Operon
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The order and sequence of amino acids are defined by
(A) Nucleotides sequences in DNA
(B) Nucleotides sequences in mRNA
(C) Nucleotides sequences in template strand of DNA
(D) Nucleotides sequences in non- template strand of DNA

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Formation of peptide bond is
(A) active process
(B)passive process
(C)both active and passive process
(D)neither active nor passive process

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