342976
Which of the following statements is correct about the role of regulatory proteins in transcription in prokaryotes?
1 They only increase expression
2 They only decrease expression
3 They interact with RNA polymerase but do not affect the expression
4 They can act both as activators and as repressors
Explanation:
Regulatory proteins affect the ability of RNA to recognize initiation sites. Regulatory proteins have both negative (repressor) and positive (activator) role.
NCERT Exemplar
BIOXII06: MOLECULAR BASIS OF INHERITANCE
342977
Why glucose cannot act as an inducer for lac operon?
1 Because they cannot bind with the repressor
2 Because they cannot bind with the operator
3 Because they cannot bind with the promoter
4 Because they cannot bind with the lac operon
Explanation:
Glucose cannot act as an inducer for lac operon because they cannot bind with the repressor
BIOXII06: MOLECULAR BASIS OF INHERITANCE
342978
The lactose operon consists of
1 Four genes- one inhibitor, one operator and two structural genes
2 Six genes- one inhibitor, one operator and four structural genes
3 Three genes- one inhibitor, one operator, and one structural genes
4 Five genes- one inhibitor, one operator and three structural genes
Explanation:
An operon is made up of 3 basic DNA components viz., a promoter, an operator and three structural genes (lacZ, lacX and lacA). That means, lac operon consists of five genes.
BIOXII06: MOLECULAR BASIS OF INHERITANCE
342979
Match Column- I with Column- II Choose the correct answer from the options given below: Column I Column II A Gene ‘a’ P β-galactosidase B Gene ‘y’ Q Transacetylase C Gene ‘i’ R Permease D Gene ‘z’ S Repressor protein
1 A-Q, B-P, C-S, D-R
2 A-Q, B-R, C-S, D-P
3 A-R, B-S, C-P, D-Q
4 A-R, B-P, C-S, D-Q
Explanation:
In a lac operon, Gene a codes for enzyme transacetylase. Gene y codes for enzyme permease.
342976
Which of the following statements is correct about the role of regulatory proteins in transcription in prokaryotes?
1 They only increase expression
2 They only decrease expression
3 They interact with RNA polymerase but do not affect the expression
4 They can act both as activators and as repressors
Explanation:
Regulatory proteins affect the ability of RNA to recognize initiation sites. Regulatory proteins have both negative (repressor) and positive (activator) role.
NCERT Exemplar
BIOXII06: MOLECULAR BASIS OF INHERITANCE
342977
Why glucose cannot act as an inducer for lac operon?
1 Because they cannot bind with the repressor
2 Because they cannot bind with the operator
3 Because they cannot bind with the promoter
4 Because they cannot bind with the lac operon
Explanation:
Glucose cannot act as an inducer for lac operon because they cannot bind with the repressor
BIOXII06: MOLECULAR BASIS OF INHERITANCE
342978
The lactose operon consists of
1 Four genes- one inhibitor, one operator and two structural genes
2 Six genes- one inhibitor, one operator and four structural genes
3 Three genes- one inhibitor, one operator, and one structural genes
4 Five genes- one inhibitor, one operator and three structural genes
Explanation:
An operon is made up of 3 basic DNA components viz., a promoter, an operator and three structural genes (lacZ, lacX and lacA). That means, lac operon consists of five genes.
BIOXII06: MOLECULAR BASIS OF INHERITANCE
342979
Match Column- I with Column- II Choose the correct answer from the options given below: Column I Column II A Gene ‘a’ P β-galactosidase B Gene ‘y’ Q Transacetylase C Gene ‘i’ R Permease D Gene ‘z’ S Repressor protein
1 A-Q, B-P, C-S, D-R
2 A-Q, B-R, C-S, D-P
3 A-R, B-S, C-P, D-Q
4 A-R, B-P, C-S, D-Q
Explanation:
In a lac operon, Gene a codes for enzyme transacetylase. Gene y codes for enzyme permease.
342976
Which of the following statements is correct about the role of regulatory proteins in transcription in prokaryotes?
1 They only increase expression
2 They only decrease expression
3 They interact with RNA polymerase but do not affect the expression
4 They can act both as activators and as repressors
Explanation:
Regulatory proteins affect the ability of RNA to recognize initiation sites. Regulatory proteins have both negative (repressor) and positive (activator) role.
NCERT Exemplar
BIOXII06: MOLECULAR BASIS OF INHERITANCE
342977
Why glucose cannot act as an inducer for lac operon?
1 Because they cannot bind with the repressor
2 Because they cannot bind with the operator
3 Because they cannot bind with the promoter
4 Because they cannot bind with the lac operon
Explanation:
Glucose cannot act as an inducer for lac operon because they cannot bind with the repressor
BIOXII06: MOLECULAR BASIS OF INHERITANCE
342978
The lactose operon consists of
1 Four genes- one inhibitor, one operator and two structural genes
2 Six genes- one inhibitor, one operator and four structural genes
3 Three genes- one inhibitor, one operator, and one structural genes
4 Five genes- one inhibitor, one operator and three structural genes
Explanation:
An operon is made up of 3 basic DNA components viz., a promoter, an operator and three structural genes (lacZ, lacX and lacA). That means, lac operon consists of five genes.
BIOXII06: MOLECULAR BASIS OF INHERITANCE
342979
Match Column- I with Column- II Choose the correct answer from the options given below: Column I Column II A Gene ‘a’ P β-galactosidase B Gene ‘y’ Q Transacetylase C Gene ‘i’ R Permease D Gene ‘z’ S Repressor protein
1 A-Q, B-P, C-S, D-R
2 A-Q, B-R, C-S, D-P
3 A-R, B-S, C-P, D-Q
4 A-R, B-P, C-S, D-Q
Explanation:
In a lac operon, Gene a codes for enzyme transacetylase. Gene y codes for enzyme permease.
342976
Which of the following statements is correct about the role of regulatory proteins in transcription in prokaryotes?
1 They only increase expression
2 They only decrease expression
3 They interact with RNA polymerase but do not affect the expression
4 They can act both as activators and as repressors
Explanation:
Regulatory proteins affect the ability of RNA to recognize initiation sites. Regulatory proteins have both negative (repressor) and positive (activator) role.
NCERT Exemplar
BIOXII06: MOLECULAR BASIS OF INHERITANCE
342977
Why glucose cannot act as an inducer for lac operon?
1 Because they cannot bind with the repressor
2 Because they cannot bind with the operator
3 Because they cannot bind with the promoter
4 Because they cannot bind with the lac operon
Explanation:
Glucose cannot act as an inducer for lac operon because they cannot bind with the repressor
BIOXII06: MOLECULAR BASIS OF INHERITANCE
342978
The lactose operon consists of
1 Four genes- one inhibitor, one operator and two structural genes
2 Six genes- one inhibitor, one operator and four structural genes
3 Three genes- one inhibitor, one operator, and one structural genes
4 Five genes- one inhibitor, one operator and three structural genes
Explanation:
An operon is made up of 3 basic DNA components viz., a promoter, an operator and three structural genes (lacZ, lacX and lacA). That means, lac operon consists of five genes.
BIOXII06: MOLECULAR BASIS OF INHERITANCE
342979
Match Column- I with Column- II Choose the correct answer from the options given below: Column I Column II A Gene ‘a’ P β-galactosidase B Gene ‘y’ Q Transacetylase C Gene ‘i’ R Permease D Gene ‘z’ S Repressor protein
1 A-Q, B-P, C-S, D-R
2 A-Q, B-R, C-S, D-P
3 A-R, B-S, C-P, D-Q
4 A-R, B-P, C-S, D-Q
Explanation:
In a lac operon, Gene a codes for enzyme transacetylase. Gene y codes for enzyme permease.
