Biology with Connect Access Card
10th Edition
ISBN: 9780077705701
Author: Raven, Peter
Publisher: McGraw-Hill Education
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 16, Problem 3A
Repression in the trp operon and induction in the lac operon are both mechanisms that
a. would only be possible with positive regulation.
b. allow the cell to control the level of enzymes to fit environmental conditions.
c. would only be possible with negative regulation.
d. cause the cell to make the enzymes from these two operons all the time.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Which of the following statements about trp operon regulation is TRUE?
A. Low trp levels result in trp repressor binding.
O B. High trp levels result in transcriptional antitermination.
C. Low trp levels cause the ribosome to fall off at the trp codons in the upstream ORF.
O D. High trp levels cause the ribosome to fall off at the trp codons in the upstream ORF.
O E. Low trp levels result in transcriptional antitermination.
QUESTION 34
Consider the following partial diploid for the lac operon system.
lacl+ O+
lac Z+Y-A-
lacls O+
1.
2.
lac Z-Y+ A+
In this configuration, which of the following statements is TRUE?
A. With no lac present, ZYA will all be expressed.
B. with lac present none of the genes (ZYA) will be expressed.
O C. With no lac present, only YA will be expressed.
D. None of these answers is correct.
E. With no lac present, only Z will be expressed.
Match the key complex or product to its related process of regulating gene expression.
a. Constitutive genes
b. Operons
c. The lac operon
d. An operator
e. A repressor
f. The trp operon
g. Tryptophan
h. A promoter
65. is induced by the presence of lactose in the environment.
66. is a repressed by the presence of tryptophan in the environment.
67. are regions of clustered genes under the control of one promoter.
In E. coli, induction in the lac operon and repression in the trp operon are both examples of
a. negative control by a repressor.
b. positive control by a repressor.
c. negative control by an activator.
d. positive control by a repressor.
Chapter 16 Solutions
Biology with Connect Access Card
Ch. 16 - In prokaryotes, control of gene expression usually...Ch. 16 - Prob. 2UCh. 16 - In E. coli, induction in the lac operon and...Ch. 16 - The lac operon is controlled by two main proteins....Ch. 16 - In eukaryotes, binding of RNA polymerase to a...Ch. 16 - In eukaryotes, the regulation of gene expression...Ch. 16 - In the trp operon, the repressor binds to DNA a....Ch. 16 - Prob. 1ACh. 16 - Specific transcription factors in eukaryotes...Ch. 16 - Repression in the trp operon and induction in the...
Ch. 16 - Regulation by small RNAs and alternative splicing...Ch. 16 - Eukaryotic mRNAs differ from prokaryotic mRNAs in...Ch. 16 - In the cell cycle, cyclin proteins are produced in...Ch. 16 - A mechanism of control in E. coli not discussed in...Ch. 16 - You have isolated a series of mutants affecting...Ch. 16 - Examples of positive and negative control of...Ch. 16 - What forms of eukaryotic control of gene...Ch. 16 - The number and type of proteins found in a cell...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- If the above gene is one of the three structural genes of the lac operon that codes for the protein/ enzyme responsible for breaking lactose into two molecules of simple sugars, what triggers the activation of this gene? a. Absence of Inhibitory protein b. Presence of lactose c. Absence of lactose d. Presence of Inhibitory protein e. Absence of Regulatory proteinarrow_forwardIf CAP is bound to the Promoter of the Lac Operon and the repressor protein is not bound to the operator, which of the following is true: a.Glucose Levels are low & Lactose is absent b.Glucose is absent & Lactose is present c.cAMP is low & Lactose is Absent d.Glucose and Lactose are Present e.cAMP is low & Lactose is presentarrow_forwardWhich of the following statements is true regarding transcriptional attenuation of the trp operon? a. The leader peptide encodes a protein that binds to the operator site b. Translation of the leader peptide stalls when tryptophan levels are high c. Stalling of the ribosome in region 1 of the leader peptide inhibits formation of the transcriptional terminator sequence d. This kind of mechanism can only occur in prokaryotes e. Both c. and d. are truearrow_forward
- A mutation in the operator region of the trp operon can prevent the trp repressor from binding to this operator. When these mutant cells are placed in a solution containing chicken broth, which of the following happens? a. Tryptophan would bind to the repressor. b. The Repressor would bind to the operator irrespective of the presence of amino acids in the environment. c. The transcription of the trip operon would be inhibited. d. The transcription of the repressor protein is inhibitedarrow_forwardMutations may have an effect on the expression of the lac operon and the trp operon. Would the following mutations have a cis- or transeffect on the expression of the protein-encoding genes in the operon? A. A mutation in the operator site that prevents lac repressor from binding to it B. A mutation in the lacI gene that prevents lac repressor from binding to DNA C. A mutation in the trpL gene that prevents attenuationarrow_forwardYou are growing E. coli in a laboratory in order to study their operons. The growth media you are using contains lactose, no glucose and no tryptophan. Using your knowledge of operons and their regulation a.Which operons would be functional under these conditions? b.What repressors would be made? (NOTE: name the repressors using their gene names) c.Which repressor(s) would be made in the inactive form? d.Which repressor(s) would be made in the active form? e.Which repressor(s) under these conditions can bind the operator sequence? f.Which repressor(s)under these conditions cannot bind the operator sequence?arrow_forward
- . For each of the following growth conditions, whatproteins would be bound to lac operon DNA? (Listthe proteins, but do not include RNA polymerase.)a. glucoseb. glucose + lactosec. lactosearrow_forwardAn operon a. is regulated by a repressor binding at the promoter. b. has structural genes that are all transcribed from the same promoter. c. have several promoters, but all of the structural genes are related biochemically. d. is a set of structural genes that are all under the same translational regulation. e. is transcribed when RNA polymerase binds the operator.arrow_forwardControl of the trp operon relies on which of the following: a. High levels of tryptophan causing a pause (but not termination) in transcription b. Low levels of tryptophan causing a pause (but not termination) in transcription c. Allolactose binding to the inhibitor to prevent it from binding to the promoter d. Tryptophan binding to the inhibitor to prevent it from binding to the promoterarrow_forward
- If lactose and glucose are provided in the growth medium of a culture of E. coli, then a. Both lactose and glucose are metabolized at same rate. b. Lactose metabolism is favored. c. CAMP-CAP complex binds CAP site. d. Lac Operon is repressed. e. Adenylate cyclase is activated.arrow_forwardOperons involved with the biosynthesis of molecules such as amino acids are most likely to be regulated in which of the following ways? a. The product of the biosynthetic pathway represses transcription. b. The product of the biosynthetic pathway activates transcription. c. A precursor of the biosynthetic pathway represses transcription. d. A precursor of the biosynthetic pathway activates transcription.arrow_forwardA mutation that inactivates transcription and translation from the regulatory gene of an inducible operon could result in: Group of answer choices A inactivation of RNA polymerase. B irreversible binding of the repressor to the operator. C three of these choices are correct D inhibition of transcription of the structural genes within the operon. E two of these choices are correct F transcription of the structural genes within that operon.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Biology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage Learning
Biology (MindTap Course List)
Biology
ISBN:9781337392938
Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Publisher:Cengage Learning
Bacterial Genomics and Metagenomics; Author: Quadram Institute;https://www.youtube.com/watch?v=_6IdVTAFXoU;License: Standard youtube license