Bio 301 Genetics Exam 3 Eastern
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What is gene regulation? What are the purposes of it? - correct answer ✔✔ Gene regulation is
when cells only express certain genes at specific times. The purpose is to conserve energy, or in
eukaryotes, to have cell specialization.
Activators:
Positive or negative control?
What types of small regulatory molecules for inducible genes?
How do they work for inducible genes?
What types of small regulatory molecules for regulatory genes?
How do they work for regulatory genes? - correct answer ✔✔ Positive control.
Have inducers for inducible genes. Only bind when inducer is present, encouraging
transcription.
Have inhibitors for repressible genes. Do not bind when inhibitor is present, preventing
transcription.
Repressors:
Positive or negative control?
What types of small regulatory molecules for inducible genes?
How do they work for inducible genes?
What types of small regulatory molecules for regulatory genes?
How do they work for regulatory genes? - correct answer ✔✔ Negative control.
, Have inducers for inducible genes. Do not bind when inducer is present, encouraging
transcription.
Have co-repressors for repressible genes. Only bind when co-repressor is present, preventing
transcription.
Operon - correct answer ✔✔ Set of genes under control of a single promoter
constitutive genes/ expression - correct answer ✔✔ Gene is unregulated and constantly
expressed.
Operator - correct answer ✔✔ Where activators and repressors bind in prokaryotes.
Catalite repression - correct answer ✔✔ Allows cell to choose which nutrient to use.
Lac operon
Is this an inducible or repressible gene?
What is the activator?
What is its small regulatory molecule and what is its name? When is this small regulatory
molecule present?
What is the repressor?
What is its small regulatory molecule and what is its name? When is this small regulatory
molecule present? - correct answer ✔✔ The lac operon is a inducible gene.
The activator is CAP, and the small regulatory molecule is an inducer called cAMP. cAMP is only
present when there is no glucose in the cell.
The repressor for this gene is also regulated by an inducer, called allolactose. Allolactose is only
present when lactose is outside of the cell.
Michigan University well answered to
pass
What is gene regulation? What are the purposes of it? - correct answer ✔✔ Gene regulation is
when cells only express certain genes at specific times. The purpose is to conserve energy, or in
eukaryotes, to have cell specialization.
Activators:
Positive or negative control?
What types of small regulatory molecules for inducible genes?
How do they work for inducible genes?
What types of small regulatory molecules for regulatory genes?
How do they work for regulatory genes? - correct answer ✔✔ Positive control.
Have inducers for inducible genes. Only bind when inducer is present, encouraging
transcription.
Have inhibitors for repressible genes. Do not bind when inhibitor is present, preventing
transcription.
Repressors:
Positive or negative control?
What types of small regulatory molecules for inducible genes?
How do they work for inducible genes?
What types of small regulatory molecules for regulatory genes?
How do they work for regulatory genes? - correct answer ✔✔ Negative control.
, Have inducers for inducible genes. Do not bind when inducer is present, encouraging
transcription.
Have co-repressors for repressible genes. Only bind when co-repressor is present, preventing
transcription.
Operon - correct answer ✔✔ Set of genes under control of a single promoter
constitutive genes/ expression - correct answer ✔✔ Gene is unregulated and constantly
expressed.
Operator - correct answer ✔✔ Where activators and repressors bind in prokaryotes.
Catalite repression - correct answer ✔✔ Allows cell to choose which nutrient to use.
Lac operon
Is this an inducible or repressible gene?
What is the activator?
What is its small regulatory molecule and what is its name? When is this small regulatory
molecule present?
What is the repressor?
What is its small regulatory molecule and what is its name? When is this small regulatory
molecule present? - correct answer ✔✔ The lac operon is a inducible gene.
The activator is CAP, and the small regulatory molecule is an inducer called cAMP. cAMP is only
present when there is no glucose in the cell.
The repressor for this gene is also regulated by an inducer, called allolactose. Allolactose is only
present when lactose is outside of the cell.
