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Lac Operon Solutions Library

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17 solutions

Lac Operon

Q. When the level of glucose in the environment is low, abundant cyclic adenosine monophosphate (CAMP) binds the catabolite activator protein (CAP) to...

Solved • May 26, 2020

Lac Operon

Q. What best defines an operon?A. a group of bacterial genes that metabolizes lactoseB. a group of bacterial genes that metabolizes any substrateC. a ...

Solved • May 20, 2020

Lac Operon

Q. Which of the following E. coli strains with the lac genotypes will synthesize beta-galactosidase in the presence of lactose?A. lacI– lacP– lacO– la...

Solved • May 20, 2020

Lac Operon

Q. A lac operon of genotype lacI– lacP+ lacO+ lacZ+ lacY+ will produce β-galactosidase AND permease whenA. glucose is present.B. lactose is present or...

Solved • May 20, 2020

Lac Operon

Q. The lac operon would produce the greatest amount of β-galactosidase whenA. both lactose and glucose are present.B. both lactose and glucose are abs...

Solved • May 20, 2020

Lac Operon

Q. Which of the following mutations would result in constitutive expression of the lac operon? a. A mutation in lacI that prevents the repressor from ...

Solved • May 19, 2020

Lac Operon

Q. In the lac operon, what are the likely effects on operon gene transcription of the mutations identified below?Mutation of consensus sequence in the...

Solved • May 12, 2020

Lac Operon

Q. What role do cAMP and CAP play in transcription of lac operon genes? A) CAP binds the CAP binding site of the lac promoter to carry out negative co...

Solved • May 7, 2020

Lac Operon

Q. Under which of the following conditions will the lac operon be expressed at the highest level? a. Glucose and lactose presentb. Glucose present, la...

Solved • May 5, 2020

Lac Operon

Q. True or false? The mechanism by which glucose inhibits expression of the lac structural genes is known as catabolite stimulation, whereas the mecha...

Solved • May 1, 2020

Lac Operon

Q. Which of the following enzymes converts ATP to cAMP? a) Galactoside permease b) β-galactosidase c) ATP synthase d) Adenylyl cyclase

Solved • May 1, 2020

Lac Operon

Q. What is the function of the lacZ gene?a) This gene encodes an enzyme, galactoside permease, which transports lactose into the cell. b) This gene en...

Solved • May 1, 2020

Lac Operon

Q. What happens to the expression of the lacI gene if lactose is not available in the cell? a) The lacI gene turns off. b) The lacI gene increases its...

Solved • May 1, 2020

Lac Operon

Q. Under which conditions are the lac structural genes expressed most efficiently? a) High glucose, no lactose b) No glucose, no lactose c) High gluco...

Solved • May 1, 2020

Lac Operon

Q. What would be the effect of a mutation in the lacI gene that prevented the repressor from binding to lactose?A. The lac Z, Y, and A genes would not...

Solved • May 1, 2020

Lac Operon

Q. You are studying a bacterium that utilizes a sugar called athelose. This sugar can be used as an energy source when necessary. Metabolism of athelo...

Solved • May 1, 2020

Lac Operon

Q. What is the role of glucose in catabolite repression?  a) It increases the levels of cAMP in the cell, stimulating transcription from the lac opero...

Solved • Apr 24, 2020