Regulation of gene expression in prokaryotes predominantly takes place at
(A)transcriptional
(B)translational level
(C)splicing gene
(D)transportation of m-RNA from cytoplasm to mesosomes

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Promoter regions of lac operon can be accessed by
(A)RNA polymerase
(B)DNA polymerase
(C)Proteins
(D)All of these

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Promoter regions of lac operon can be regulated by
(A)operator region only
(B)structural region
(C)both operator and structural region
(D)operator , structural and promoter region

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The lac in lac operon refers to
(A)lactose but not lactase
(B)lactase but not lactose
(C)lactobacillus but not lactose
(D)lactose as well as laevorotatory

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The i-gene in lac operon refers to
(A)inducer
(B)inhibitor
(C)sometimes inducer sometimes inhibitor
(D)neither inducer nor inhibitor

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In lac operon
(A)3 structural, 1 operator and 2 promoter genes are present
(B) 3 structural, 1 operator and 1 promoter genes are present
(C) 3 structural, 2 operator and 1 promoter genes are present
(D) 3 structural, 1 operator and 3 promoter genes are present

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For lactose metabolism
(A)all three gene products are required
(B)only regulator gene products are required
(C)only Beta-galactosidase
are required
(D) Beta-galactosidase and permease are required

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

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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

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