The figure above shows the structure of lac operon. Which of the following BEST describes what happens in the presence of lactose? Select one: Repressor-lactose complex forms, both the complex and RNA polymerase bind to R. Transcription of S is initiated. Repressor-lactose complex forms and the complex will not bind to R. Transcription of S is initiated. Both repressor and RNA polymerase bind to R. Transcription of S is initiated. Repressor-lactose complex forms and the complex binds to R. Transcription of S is prevented

The figure above shows the structure of lac operon. Which of the following BEST describes what happens in the presence of lactose? Select one: Repressor-lactose complex forms, both the complex and RNA polymerase bind to R. Transcription of S is initiated. Repressor-lactose complex forms and the complex will not bind to R. Transcription of S is initiated. Both repressor and RNA polymerase bind to R. Transcription of S is initiated. Repressor-lactose complex forms and the complex binds to R. Transcription of S is prevented

Name: The figure above shows the structure of lac operon. Which of the follo
Uploaded: 2024-03-20T06:42:41.000Z
Channel: Bartleby
Description: The figure above shows the structure of lac operon. Which of the following BEST describes what happens in the presence of lactose? Select one:Repressor-lactose complex forms, both the complex and RNA polymerase bind to R. Transcription of S is initia

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 9TYU: A mutation that inactivates the repressor gene of the lac operon results in (a) the continuous...

See similar textbooks

Similar questions

Match each of the following mechanisms with how it can change the levels of gene products--whether on different operons or within the same operon. Different promoters might have different DNA sequences Translation initiation sequences can cause different open reading 1. Differences in mRNA levels BETWEEN operons frames to be translated 2. Differences in protein levels WITHIN an operon differently. The secondary structures of MRNA can differ which can change the rate of degradation of transcripts.
Given the Table below concerning the lac operon, match the letter with what would be occurring for each scenario. Repressor is bound to the operator, cAMP complex is bound and transcription is prevented. Allolactose is bound to the repressor, cAMP complex is bound, and transcription is prevalent. Allolactose is bound to the repressor, cAMP complex is not assembled, and transcription is slow Repressor is bound to the operator, cAMP complex is not assembled, and transcription is prevented.
What is a specific region in the trp operon that you could mutate so it expresses the trp operon in conditions of excess tryptophan. Why will this mutation cause this? Operon structure: promoter, operater, structural genes promoter - DNA region that is the site of RNA polymerase sigma binding and transcription initiation operator – DNA region that influences gene expression through its interaction with a protein (transcription factor) structural genes – gene whose expression is being regulated; encodes a polypeptide or functional RNA
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
Which of the following statements about the trp operon is false? If a mutation in region 2 prevents the formation of the 2 + 3 loop in the 5’UTR transcription levels will increase. The trp operon is an example of negative repressible operon. Formation of the anti-terminator in the 5’UTR of the trp operon occurs when trp levels are low. In the presence of high trp-tRNA, the genes of the trp operon are not expressed. The role of trp is to bind to the repressor protein and activate it.
. In the tryptophan operon of E. coli, what happens when tryptophan levels get too high? tryptophan is removed from its co-repressor, causing it to detach from the operator tryptophan is removed from its co-repressor, causing it to attach to the operator tryptophan is bound to its co-repressor, causing it to detach from the operator tryptophan is bound to its co-repressor, causing it to attach to the operator all of the above occur at equal rates when tryptophan levels get too high
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.
The tryptophan (trp) operon is a repressible system. This means the genes are normally expressed, but the presence of trp can repress the operon the genes are normally repressed the genes are normally expressed when trp is present the genes are normally repressed, but the presence of trp can activate the genes
Which of the following conditions is most likely to result in an increase rate of transcription of the lac operon? when lactose is present AND the repressor is permanently attached to the operator when lactose is present and there is high levels of glucose when lactose is absent and there are low levels of glucose when lactose is present and there are low levels of glucose
As diagrammed below, some amino acid biosynthetic operons have stem loop structures in the mRNA. These structures play a role in the regulation of the operon by which of the following mechanisms? Translation stop codon- Attenuator loop. mRNA 5' 3' DNA attenuator trpE O Catabolite repressor protein can bind and prevent the hairpins from forming thus allowing translation to occur. O The leader sequence shown contains codons for the amino acid. When these are low, the ribosome stalls, allowing a hairpin between the two middle regions to form so that the rest of the message can be translated. In the presence of large amounts of the amino acid, the hairpin will wind around the amino acid and prevent further translation. O A repressor protein made of that amino acid will bind to the region and prevent translation when large amounts of the amino acid are present. O The uridine-rich region has codons for that amino acid; when present, this region will be a terminator region. The hairpins allow…
Regulation of the E. coli trp operon by attenuation requires the trp repressor protein. prevents transcription of the trp operon structural genes in response to high levels of charged tryptophan TRNAS. occurs because tryptophan binds to the trp repressor. prevents transcription of the trp operon structural genes in the presence of high levels of glucose.
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