342954
Which of the following events would occur in 'Lac-operon' of E. coli when the growth medium has high concentration of lactose?
1 The structural genes fail to produce polycistronic mRNA.
2 The repressor protein binds to RNA polymerase and prevents translation.
3 The repressor protein attaches to the promoter sequence and derepresses the operator.
4 The inducer molecule binds to repressor protein and RNA polymerase binds to promoter sequence.
Explanation:
The regulator i gene codes for active repressor protein but lactose or allolactose binds to the repressor protein and - vates it thereby preventing it from binding to the lac operator. RNA polymerase can now access the promoter and transcribe the structureal genes. Enzymes needed for using lactose are made.
KCET - 2014
BIOXII06: MOLECULAR BASIS OF INHERITANCE
342955
A polycistronic structural gene is regulated by a
1 Common promoter
2 Regulatory genes
3 Both of them
4 None of them
Explanation:
A polycistronic structural gene is regulated by a common promoter and regulatory genes
BIOXII06: MOLECULAR BASIS OF INHERITANCE
342974
When will the rate of transcription in lac operon be minimum
1 Glucose is maximum in medium
2 Lactose is minimum in medium
3 Lactose is maximum in medium
4 Galactose is minimum in medium
Explanation:
The rate of transcription in lac operon will be minimum when lactose is minimum in medium
BIOXII06: MOLECULAR BASIS OF INHERITANCE
342956
The Lac Operon is turned on when allolactose molecules bind to:
1 Promoter site
2 Operator site
3 mRNA
4 Repressor protein
Explanation:
The regulator i gene codes for active repressor protein but lactose or allolactose binds to the repressor protein and inactivates it thereby preventing it from binding to the lac operator. RNA polymerase can now access the promoter and transcribe the structural genes.
NEET Test Series from KOTA - 10 Papers In MS WORD
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BIOXII06: MOLECULAR BASIS OF INHERITANCE
342954
Which of the following events would occur in 'Lac-operon' of E. coli when the growth medium has high concentration of lactose?
1 The structural genes fail to produce polycistronic mRNA.
2 The repressor protein binds to RNA polymerase and prevents translation.
3 The repressor protein attaches to the promoter sequence and derepresses the operator.
4 The inducer molecule binds to repressor protein and RNA polymerase binds to promoter sequence.
Explanation:
The regulator i gene codes for active repressor protein but lactose or allolactose binds to the repressor protein and - vates it thereby preventing it from binding to the lac operator. RNA polymerase can now access the promoter and transcribe the structureal genes. Enzymes needed for using lactose are made.
KCET - 2014
BIOXII06: MOLECULAR BASIS OF INHERITANCE
342955
A polycistronic structural gene is regulated by a
1 Common promoter
2 Regulatory genes
3 Both of them
4 None of them
Explanation:
A polycistronic structural gene is regulated by a common promoter and regulatory genes
BIOXII06: MOLECULAR BASIS OF INHERITANCE
342974
When will the rate of transcription in lac operon be minimum
1 Glucose is maximum in medium
2 Lactose is minimum in medium
3 Lactose is maximum in medium
4 Galactose is minimum in medium
Explanation:
The rate of transcription in lac operon will be minimum when lactose is minimum in medium
BIOXII06: MOLECULAR BASIS OF INHERITANCE
342956
The Lac Operon is turned on when allolactose molecules bind to:
1 Promoter site
2 Operator site
3 mRNA
4 Repressor protein
Explanation:
The regulator i gene codes for active repressor protein but lactose or allolactose binds to the repressor protein and inactivates it thereby preventing it from binding to the lac operator. RNA polymerase can now access the promoter and transcribe the structural genes.
342954
Which of the following events would occur in 'Lac-operon' of E. coli when the growth medium has high concentration of lactose?
1 The structural genes fail to produce polycistronic mRNA.
2 The repressor protein binds to RNA polymerase and prevents translation.
3 The repressor protein attaches to the promoter sequence and derepresses the operator.
4 The inducer molecule binds to repressor protein and RNA polymerase binds to promoter sequence.
Explanation:
The regulator i gene codes for active repressor protein but lactose or allolactose binds to the repressor protein and - vates it thereby preventing it from binding to the lac operator. RNA polymerase can now access the promoter and transcribe the structureal genes. Enzymes needed for using lactose are made.
KCET - 2014
BIOXII06: MOLECULAR BASIS OF INHERITANCE
342955
A polycistronic structural gene is regulated by a
1 Common promoter
2 Regulatory genes
3 Both of them
4 None of them
Explanation:
A polycistronic structural gene is regulated by a common promoter and regulatory genes
BIOXII06: MOLECULAR BASIS OF INHERITANCE
342974
When will the rate of transcription in lac operon be minimum
1 Glucose is maximum in medium
2 Lactose is minimum in medium
3 Lactose is maximum in medium
4 Galactose is minimum in medium
Explanation:
The rate of transcription in lac operon will be minimum when lactose is minimum in medium
BIOXII06: MOLECULAR BASIS OF INHERITANCE
342956
The Lac Operon is turned on when allolactose molecules bind to:
1 Promoter site
2 Operator site
3 mRNA
4 Repressor protein
Explanation:
The regulator i gene codes for active repressor protein but lactose or allolactose binds to the repressor protein and inactivates it thereby preventing it from binding to the lac operator. RNA polymerase can now access the promoter and transcribe the structural genes.
342954
Which of the following events would occur in 'Lac-operon' of E. coli when the growth medium has high concentration of lactose?
1 The structural genes fail to produce polycistronic mRNA.
2 The repressor protein binds to RNA polymerase and prevents translation.
3 The repressor protein attaches to the promoter sequence and derepresses the operator.
4 The inducer molecule binds to repressor protein and RNA polymerase binds to promoter sequence.
Explanation:
The regulator i gene codes for active repressor protein but lactose or allolactose binds to the repressor protein and - vates it thereby preventing it from binding to the lac operator. RNA polymerase can now access the promoter and transcribe the structureal genes. Enzymes needed for using lactose are made.
KCET - 2014
BIOXII06: MOLECULAR BASIS OF INHERITANCE
342955
A polycistronic structural gene is regulated by a
1 Common promoter
2 Regulatory genes
3 Both of them
4 None of them
Explanation:
A polycistronic structural gene is regulated by a common promoter and regulatory genes
BIOXII06: MOLECULAR BASIS OF INHERITANCE
342974
When will the rate of transcription in lac operon be minimum
1 Glucose is maximum in medium
2 Lactose is minimum in medium
3 Lactose is maximum in medium
4 Galactose is minimum in medium
Explanation:
The rate of transcription in lac operon will be minimum when lactose is minimum in medium
BIOXII06: MOLECULAR BASIS OF INHERITANCE
342956
The Lac Operon is turned on when allolactose molecules bind to:
1 Promoter site
2 Operator site
3 mRNA
4 Repressor protein
Explanation:
The regulator i gene codes for active repressor protein but lactose or allolactose binds to the repressor protein and inactivates it thereby preventing it from binding to the lac operator. RNA polymerase can now access the promoter and transcribe the structural genes.
