1.) What type of control best describes the lac operon when it is regulated by allolactose? Explain the features of this type of regulation using the lac operon as an example.
2.) What is positive gene regulation?
a) when an activator protein binds to the operator of a gene to turn expression off
b) when a repressor protein binds to the operator of a gene to turn expression off
c) when an activator protein binds to the operator of a gene to turn expression on
d) when a repressor protein binds to the operator of a gene to turn expression on
e) when a protein binds to DNA to change gene expression
3.) In the lactose operon of E. coli, what is the function of each of the following genes or sites: a) regulator, b) operator, c) promoter, d) structural gene Z and e) structural gene Y?
a) regulator gene
b) operator
c) promoter
d) structural gene Z
e) structural gene Y
4.) In a negative, repressible regulatory mechanism, transcription of the structural gene(s) occurs in
a) the presence of the co-repressor, but not in its absence.
b) the absence of the co-repressor, but not in its presence.
c) the presence of the inducer, but not in its absence.
d) the absence of the inducer but not in its presence.
e) the absence or presence of the co-repressor.
What are answers and can you explain them to me?
1.) What type of control best describes the lac operon when it is regulated by allolactose? Explain the features of this type of regulation using the lac operon as an example.
2.) What is positive gene regulation?
a) when an activator protein binds to the operator of a gene to turn expression off
b) when a repressor protein binds to the operator of a gene to turn expression off
c) when an activator protein binds to the operator of a gene to turn expression on
d) when a repressor protein binds to the operator of a gene to turn expression on
e) when a protein binds to DNA to change gene expression
3.) In the lactose operon of E. coli, what is the function of each of the following genes or sites: a) regulator, b) operator, c) promoter, d) structural gene Z and e) structural gene Y?
a) regulator gene
b) operator
c) promoter
d) structural gene Z
e) structural gene Y
4.) In a negative, repressible regulatory mechanism, transcription of the structural gene(s) occurs in
a) the presence of the co-repressor, but not in its absence.
b) the absence of the co-repressor, but not in its presence.
c) the presence of the inducer, but not in its absence.
d) the absence of the inducer but not in its presence.
e) the absence or presence of the co-repressor.
What are answers and can you explain them to me?
Related textbook solutions
Related questions
The Lac repressor protein binds to the:
| A) | lacZ gene in the presence of allolactose. |
| B) | operator in the presence of allolactose. |
| C) | operator in the absence of allolactose. |
| D) | operator regardless of the presence or absence ofallolactose. |
