Regulation of Gene Expression and Lac Operon
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BIOXII06: MOLECULAR BASIS OF INHERITANCE

342946 Select the correct option from the following statements
A. Lactose is the inducer
B. A very high level of expression of lac operon has to be present in the cell all the time, otherwise lactose cannot enter the cells.
C. The repressor protein binds to the operator region of the operon and prevents RNA polymerase from transcribing the operon.
D. In the presence of an inducer, such as lactose or allolactose, the repressor is activated by interaction with the inducer

1 A, D
2 B, D
3 B, C
4 A, C
BIOXII06: MOLECULAR BASIS OF INHERITANCE

342947 Catabolite repression of lac operon in E.coli occurs in presence of

1 Glucose
2 Lactose
3 Allolactose
4 Glucose to Lactose
BIOXII06: MOLECULAR BASIS OF INHERITANCE

342948 Match the columns I and II
Column I
Column II
A
i gene
P
Transacetylase
B
z gene
Q
Repressor of the lac operon
C
y gene
R
Permease
D
a gene
S
Betagalactosidase

1 \(\mathrm{A}-\mathrm{R}, \mathrm{B}-\mathrm{P}, \mathrm{C}-\mathrm{Q}, \mathrm{D}-\mathrm{S}\)
2 \(\mathrm{A}-\mathrm{Q}, \mathrm{B}-\mathrm{R}, \mathrm{C}-\mathrm{P}, \mathrm{D}-\mathrm{S}\)
3 \(\mathrm{A}-\mathrm{P}, \mathrm{B}-\mathrm{R}, \mathrm{C}-\mathrm{Q}, \mathrm{D}-\mathrm{S}\)
4 \(\mathrm{A}-\mathrm{Q}, \mathrm{B}-\mathrm{S}, \mathrm{C}-\mathrm{R}, \mathrm{D}-\mathrm{P}\)
BIOXII06: MOLECULAR BASIS OF INHERITANCE

342949 Match the columns I and II.
Column I
Column II
A
Repressor
P
Increases permeability of lactose
B
Betagalactosidase
Q
Hydrolysis of the disaccharide
C
Permease
R
Acetylation of galactosides
D
Transacetylase
S
Binds to the operator

1 \(\mathrm{A}-\mathrm{R}, \mathrm{B}-\mathrm{P}, \mathrm{C}-\mathrm{Q}, \mathrm{D}-\mathrm{S}\)
2 \(\mathrm{A}-\mathrm{S}, \mathrm{B}-\mathrm{Q}, \mathrm{C}-\mathrm{P}, \mathrm{D}-\mathrm{R}\)
3 \(\mathrm{A}-\mathrm{P}, \mathrm{B}-\mathrm{R}, \mathrm{C}-\mathrm{Q}, \mathrm{D}-\mathrm{S}\)
4 \(\mathrm{A}-\mathrm{Q}, \mathrm{B}-\mathrm{P}, \mathrm{C}-\mathrm{R}, \mathrm{D}-\mathrm{S}\)
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BIOXII06: MOLECULAR BASIS OF INHERITANCE

342946 Select the correct option from the following statements
A. Lactose is the inducer
B. A very high level of expression of lac operon has to be present in the cell all the time, otherwise lactose cannot enter the cells.
C. The repressor protein binds to the operator region of the operon and prevents RNA polymerase from transcribing the operon.
D. In the presence of an inducer, such as lactose or allolactose, the repressor is activated by interaction with the inducer

1 A, D
2 B, D
3 B, C
4 A, C
BIOXII06: MOLECULAR BASIS OF INHERITANCE

342947 Catabolite repression of lac operon in E.coli occurs in presence of

1 Glucose
2 Lactose
3 Allolactose
4 Glucose to Lactose
BIOXII06: MOLECULAR BASIS OF INHERITANCE

342948 Match the columns I and II
Column I
Column II
A
i gene
P
Transacetylase
B
z gene
Q
Repressor of the lac operon
C
y gene
R
Permease
D
a gene
S
Betagalactosidase

1 \(\mathrm{A}-\mathrm{R}, \mathrm{B}-\mathrm{P}, \mathrm{C}-\mathrm{Q}, \mathrm{D}-\mathrm{S}\)
2 \(\mathrm{A}-\mathrm{Q}, \mathrm{B}-\mathrm{R}, \mathrm{C}-\mathrm{P}, \mathrm{D}-\mathrm{S}\)
3 \(\mathrm{A}-\mathrm{P}, \mathrm{B}-\mathrm{R}, \mathrm{C}-\mathrm{Q}, \mathrm{D}-\mathrm{S}\)
4 \(\mathrm{A}-\mathrm{Q}, \mathrm{B}-\mathrm{S}, \mathrm{C}-\mathrm{R}, \mathrm{D}-\mathrm{P}\)
BIOXII06: MOLECULAR BASIS OF INHERITANCE

342949 Match the columns I and II.
Column I
Column II
A
Repressor
P
Increases permeability of lactose
B
Betagalactosidase
Q
Hydrolysis of the disaccharide
C
Permease
R
Acetylation of galactosides
D
Transacetylase
S
Binds to the operator

1 \(\mathrm{A}-\mathrm{R}, \mathrm{B}-\mathrm{P}, \mathrm{C}-\mathrm{Q}, \mathrm{D}-\mathrm{S}\)
2 \(\mathrm{A}-\mathrm{S}, \mathrm{B}-\mathrm{Q}, \mathrm{C}-\mathrm{P}, \mathrm{D}-\mathrm{R}\)
3 \(\mathrm{A}-\mathrm{P}, \mathrm{B}-\mathrm{R}, \mathrm{C}-\mathrm{Q}, \mathrm{D}-\mathrm{S}\)
4 \(\mathrm{A}-\mathrm{Q}, \mathrm{B}-\mathrm{P}, \mathrm{C}-\mathrm{R}, \mathrm{D}-\mathrm{S}\)
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BIOXII06: MOLECULAR BASIS OF INHERITANCE

342946 Select the correct option from the following statements
A. Lactose is the inducer
B. A very high level of expression of lac operon has to be present in the cell all the time, otherwise lactose cannot enter the cells.
C. The repressor protein binds to the operator region of the operon and prevents RNA polymerase from transcribing the operon.
D. In the presence of an inducer, such as lactose or allolactose, the repressor is activated by interaction with the inducer

1 A, D
2 B, D
3 B, C
4 A, C
BIOXII06: MOLECULAR BASIS OF INHERITANCE

342947 Catabolite repression of lac operon in E.coli occurs in presence of

1 Glucose
2 Lactose
3 Allolactose
4 Glucose to Lactose
BIOXII06: MOLECULAR BASIS OF INHERITANCE

342948 Match the columns I and II
Column I
Column II
A
i gene
P
Transacetylase
B
z gene
Q
Repressor of the lac operon
C
y gene
R
Permease
D
a gene
S
Betagalactosidase

1 \(\mathrm{A}-\mathrm{R}, \mathrm{B}-\mathrm{P}, \mathrm{C}-\mathrm{Q}, \mathrm{D}-\mathrm{S}\)
2 \(\mathrm{A}-\mathrm{Q}, \mathrm{B}-\mathrm{R}, \mathrm{C}-\mathrm{P}, \mathrm{D}-\mathrm{S}\)
3 \(\mathrm{A}-\mathrm{P}, \mathrm{B}-\mathrm{R}, \mathrm{C}-\mathrm{Q}, \mathrm{D}-\mathrm{S}\)
4 \(\mathrm{A}-\mathrm{Q}, \mathrm{B}-\mathrm{S}, \mathrm{C}-\mathrm{R}, \mathrm{D}-\mathrm{P}\)
BIOXII06: MOLECULAR BASIS OF INHERITANCE

342949 Match the columns I and II.
Column I
Column II
A
Repressor
P
Increases permeability of lactose
B
Betagalactosidase
Q
Hydrolysis of the disaccharide
C
Permease
R
Acetylation of galactosides
D
Transacetylase
S
Binds to the operator

1 \(\mathrm{A}-\mathrm{R}, \mathrm{B}-\mathrm{P}, \mathrm{C}-\mathrm{Q}, \mathrm{D}-\mathrm{S}\)
2 \(\mathrm{A}-\mathrm{S}, \mathrm{B}-\mathrm{Q}, \mathrm{C}-\mathrm{P}, \mathrm{D}-\mathrm{R}\)
3 \(\mathrm{A}-\mathrm{P}, \mathrm{B}-\mathrm{R}, \mathrm{C}-\mathrm{Q}, \mathrm{D}-\mathrm{S}\)
4 \(\mathrm{A}-\mathrm{Q}, \mathrm{B}-\mathrm{P}, \mathrm{C}-\mathrm{R}, \mathrm{D}-\mathrm{S}\)
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BIOXII06: MOLECULAR BASIS OF INHERITANCE

342946 Select the correct option from the following statements
A. Lactose is the inducer
B. A very high level of expression of lac operon has to be present in the cell all the time, otherwise lactose cannot enter the cells.
C. The repressor protein binds to the operator region of the operon and prevents RNA polymerase from transcribing the operon.
D. In the presence of an inducer, such as lactose or allolactose, the repressor is activated by interaction with the inducer

1 A, D
2 B, D
3 B, C
4 A, C
BIOXII06: MOLECULAR BASIS OF INHERITANCE

342947 Catabolite repression of lac operon in E.coli occurs in presence of

1 Glucose
2 Lactose
3 Allolactose
4 Glucose to Lactose
BIOXII06: MOLECULAR BASIS OF INHERITANCE

342948 Match the columns I and II
Column I
Column II
A
i gene
P
Transacetylase
B
z gene
Q
Repressor of the lac operon
C
y gene
R
Permease
D
a gene
S
Betagalactosidase

1 \(\mathrm{A}-\mathrm{R}, \mathrm{B}-\mathrm{P}, \mathrm{C}-\mathrm{Q}, \mathrm{D}-\mathrm{S}\)
2 \(\mathrm{A}-\mathrm{Q}, \mathrm{B}-\mathrm{R}, \mathrm{C}-\mathrm{P}, \mathrm{D}-\mathrm{S}\)
3 \(\mathrm{A}-\mathrm{P}, \mathrm{B}-\mathrm{R}, \mathrm{C}-\mathrm{Q}, \mathrm{D}-\mathrm{S}\)
4 \(\mathrm{A}-\mathrm{Q}, \mathrm{B}-\mathrm{S}, \mathrm{C}-\mathrm{R}, \mathrm{D}-\mathrm{P}\)
BIOXII06: MOLECULAR BASIS OF INHERITANCE

342949 Match the columns I and II.
Column I
Column II
A
Repressor
P
Increases permeability of lactose
B
Betagalactosidase
Q
Hydrolysis of the disaccharide
C
Permease
R
Acetylation of galactosides
D
Transacetylase
S
Binds to the operator

1 \(\mathrm{A}-\mathrm{R}, \mathrm{B}-\mathrm{P}, \mathrm{C}-\mathrm{Q}, \mathrm{D}-\mathrm{S}\)
2 \(\mathrm{A}-\mathrm{S}, \mathrm{B}-\mathrm{Q}, \mathrm{C}-\mathrm{P}, \mathrm{D}-\mathrm{R}\)
3 \(\mathrm{A}-\mathrm{P}, \mathrm{B}-\mathrm{R}, \mathrm{C}-\mathrm{Q}, \mathrm{D}-\mathrm{S}\)
4 \(\mathrm{A}-\mathrm{Q}, \mathrm{B}-\mathrm{P}, \mathrm{C}-\mathrm{R}, \mathrm{D}-\mathrm{S}\)