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iPoz ya Transcription lac mRNA mRNA- E 60 Translation E T Enzymes O A-Galactosidase, B-Permease, C- Transacetylase, D-Repressor protein, E-Inducer (lactose) O A-Galactosidase, B-Permease, C- Transcetylase, D-Inducer (lactose), E-Repressor protein O A-Galactosidase, B-Transacetylase, C-Permease, D-Repressor protein, E- Inducer (lactose) O A-Permease, B-Transacetylase, C- Galactosidase, D-Repressor protein, E-Inducer (Lactose)

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Similar Questions
Q1
In E.coli, three enzymes B-galactosidase, permease and transacetylase began to be produced as soon as lactose was added. Explain why the enzymes were not forming in the absence of lactose.
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Q2
Match the following genes of the Lac operon with their respective products.
a. i gene i. β−galactosidase
b. z gene ii. Permease
c. a gene iii. Repressor
d. y gene iv. Transacetylase

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Q3
Identify the correct labellings for Q, R, S and T for the lac operon in E.coli as given below :


Choose the correct option from the given table :

QRSS(A)Structural geneOperatorβ-GalactosidaseRepressor(B)Regulatory genePrometerTransacetylaseRepressor protein(C)Structural geneOperatorPermeaseRepressor protein(D)Regulatory genePromoterβ-GalactosidaseRepressor
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Q4
Read the statement regarding the lac operon and choose the correct option
1. An inducer regulates the switching on and off of lac operon
2. Repressor protein dissociates from operator region and prevents RNA polymerase from transcribing the operon
3. In the presence of lactose, the repressor is activated by interaction with lactose
4. RNA polymerase has access to the promoter and transcription proceeds only when the repressor is inactivated
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Q5
Match the enzyme in column I with its function in column II and choose the correct option.
Column IColumn II
A. β-galactosidase1. Joining of DNA fragments
B. Permease2. Peptide bond formation
C. Ligase3. Hydrolysis of lactose
D. Ribozyme4. Increases permeability to β-galactosidase

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