If a researcher moves the operator to the far end of the operon, which of the following processes would likely occur when the cell is exposed to lactose? O The repressor will no longer bind to the operator. O Nothing would change. O The operon will never be transcribed. O The inducer will no longer bind to the repressor. O The genes of the lac operon will be transcribed continuously.

If a researcher moves the operator to the far end of the operon, which of the following processes would likely occur when the cell is exposed to lactose? O The repressor will no longer bind to the operator. O Nothing would change. O The operon will never be transcribed. O The inducer will no longer bind to the repressor. O The genes of the lac operon will be transcribed continuously.

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Description: If a researcher moves the operator to the far end of the operon, which of the following processeswould likely occur when the cell is exposed to lactose?O The repressor will no longer bind to the operator.O Nothing would change.O The operon will neve

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter14: Gene Regulation

Section: Chapter Questions

Problem 11TYU

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All of the following statements about the repressor of the lac operon of E. coli are true EXCEPT which one? O A. The repressor is the product of a regulatory gene i The repressor binds to the operator region of the DNA of the lac OB. operon. The repressor is a protein. OC. The repressor interacts with the operator in such a way as to OD. prevent translation of beta-galactosidase. The repressor can combine with lactose to form a OE. complex that will no longer bind to the operator region. QUESTION 32 The amino acid which is a precursor of serotonin is Histidine OA. O B. Tyrosine O C. Glutamate D. Tryptophan O E. none of the above
A mutant strain has a defective lac operator site that results in theconstitutive expression of the lac operon. Outline an experimentyou would carry out to demonstrate that the operator site mustbe physically adjacent to the genes that it influences. Based onyour knowledge of the lac operon, describe the results you wouldexpect.
What would occur if the repressor of an inducible operon were mutated so it could not bind the operator? Build up of a substrate wihin the pathway controlled by the operon Continuous transcription of the operon's genes Irreversible binding of the repressor to the promoter Reduced transcription of the operon's genes O O O O
If a particular operon encodes enzymes for making an essential amino acid is regulated like the trp operon, then: O the amino acid activates the repressor O the amino acid turns off transcription of the regulatory gene O the amino acid turns on transcription of the operon O the repressor is active in the absence of the amino acid
The lac operon produces: (choose the best answer) OA single mRNA molecule O A single protein OA single mRNA molecule and a single protein O Multiple proteins OA single mRNA molecule and multiple proteins
For an enzyme to be produced from an inducible operon, the repressor must bind to and digest the substrate. the substrate must bind to the repressor and remove it from the operator. the substrate must bind to the operator. the repressor must be bound to the operator.
In the lac operon (above), what happens when glucose levels are low, but lactose levels increase? the repressor protein is detached from the operator, and transcription is not initiated the repressor protein is attached to the operator, and transcription is not initiated the repressor protein is detached from the operator, and transcription is initiated the repressor protein is attached to the operator, and transcription is initiated. Check all of the above occur at equal rates when glucose levels are low but lactose levels are high
A mutation at the operator prevents the regulator protein from bindingWhat effect will this mutation have in the following types of operons? a. Regulator protein is a repressor of a repressible operon. b. Regulator protein is a repressor of an inducible operon.
Which of the following statements about the lactose operon in E. coli is TRUE? It contains the genes that encode the proteins for lactose metabolism. Its transcription is blocked when allolactose binds to the lac repressor. It contains a promoter, an operator and an attenuator. It is barely transcribed, when lactose is present in the medium and glucose is absent. It is transcribed at very high levels, when lactose is absent, and glucose is present.
Operons are clusters of genes that are regulated as a group. They can be characterized as either repressible or inducible. What is the main difference between the two? * O An inducible operon is usually off while a repressible operon is usually on. Binding to a repressor molecule turns repressible operons off and inducible operons on. Repressible operons turn off when the repressor is active while inducible operons turn on when the repressor is active. Inducible operons require a co-repressor to turn the operon off.
You can determine the regulation of an unknown operon based on descriptions like those in the table below. For each row, choose whether the fact would suggest positive or negative or inducible or repressible regulation and indicate your answer with an X in the column. Only one X should appear in each row. In the presence of the signal, the structural genes are expressed. In the presence of the signal, the structural genes are not expressed. In the absence of the signal, the structural genes are expressed. In the absence of the signal, the structural genes are not expressed. The binding of the regulatory protein to the operon results in structural gene expression. The binding of the regulatory protein to the operon prevents structural gene expression. A mutation in the regulatory protein results in constitutive expression of the structural genes. A mutation in the regulatory protein results in no or low expression of the structural genes. Positive? Negative? Inducible? Repressible?
The lac operon has which of the following characteristics? O 1) usually requires an activator protein bound to the promoter to be transcribed. O 2) is inactive in the presence of lactose. O 3) is active in the presence of a repressor. O 4) Is a constitutively active operator. O5) is only active in the presence of lactose.