Lac Operon IPOZY v3 In the genotype presented (genomic plus plasmid genes), which of the following...
Lac Operon IPOZY v3 In the genotype presented (genomic plus
plasmid genes), which of the following statements is consistent
with the expression phenotype? genome: I+P+ O- Z+ Y- plasmid: I+ P-
O+ Z- Y+
-
constitutive expression of β-gal and permease induced in the presence of lactose
-
constitutive expression of β-gal only
-
constitutive expression of β-gal and permease
-
β-gal and permease induced in the presence of lactose
-
constitutive expression of permease and β-gal induced in the presence of lactose
Homework Answers
1. Answer: Option 5
is correct
Explanation:
The Lac operon is a negatively regulated inducible operon.
It is expressed only in the presence of lactose provided that
glucose is absent.
Genotype = I+P+O-Z+Y-/I+P-O+Z-Y+
Genomic copy = I+P+O-Z+Y-
Since it is O-, Z+ (Beta-gal) is expressed in the presence of
lactose.
Plasmid copy = I+P-O+Z-Y+
Since it is P-, Y+ (Permease) is never expressed.
= Inducible expression of LacZ and constitutive repression of
LacY
Add Answer to:
Lac Operon IPOZY v3 In the genotype presented (genomic plus
plasmid genes), which of the following...
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The lac operon in E. coli is a well-studied gene system, and β-galactosidase (β-gal) is the...
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in the genotype indicates a functioning gene, while a – indicates a
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Consider the following partial diploid genotype of an Escherichia coli strain regarding the lac operon: lact P+O+Z+Y+ A+/lacp+O+Z+Y+ A+ In the PRESENCE of lactose, what is the state of beta- galactosidase expression? O A.- OB. + OC. Can't tell
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The following shows the genotype of a partial diploid bacterial cell - where one chromosomal region...
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in the genotype indicates a functioning gene, while a – indicates a
loss-of-function allele. The OC is an operator mutant that cannot
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