Microbiology: A Systems Approach
4th Edition
ISBN: 9780073402437
Author: Marjorie Kelly Cowan Professor
Publisher: McGraw-Hill Education
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Chapter 9, Problem 7MCQ
The lac operon is usually in the _____ position and is activated by a/an _____ molecule.
- a. on, repressor
- b. off, inducer
- c. on, inducer
- d. off, repressor
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As trytophan levels increase in the cell, _____ bind(s) to active aporepressors, causing ______ of tryptophan operon.
a.
inducers, negative regulation
b.
repressors, co-repressing
c.
tryptophan, negative regulation
d.
tryptophan, positive regulation
e.
B-lactose, negative regulation
The tryptophan operon is a repressible operon that is
A. transcribed only when glucose is present in the growth medium
B. not transcribed whenever tryptophan is plentiful in the growth medium
C. permanently turned on
D. turned on only when tryptophan is present in the growth medium
In the txp operon, a repressor protein acquires a mutation such that it cannot bind to tryptophan. What will be the effect on the trp operon? 1. turned off permanently 2. turned on permanenty 3. constitutive4. a and c5. b and c
Chapter 9 Solutions
Microbiology: A Systems Approach
Ch. 9.1 - Define the terms genome and gene.Ch. 9.1 - Differentiate between genotype and phenotype.Ch. 9.1 - Diagram a segment of DNA, labeling all important...Ch. 9.1 - Summarize the steps of bacterial DNA replication...Ch. 9.1 - Compare and contrast the synthesis of leading and...Ch. 9.2 - Explain how the classical view of the central...Ch. 9.2 - Prob. 7AYPCh. 9.2 - Illustrate the steps of transcription, noting the...Ch. 9.2 - Prob. 9AYPCh. 9.2 - Prob. 10AYP
Ch. 9.2 - Identify the locations of the promoter, the start...Ch. 9.2 - Prob. 12AYPCh. 9.2 - Prob. 13AYPCh. 9.3 - Define the term operon and explain one advantage...Ch. 9.3 - Differentiate between repressive and inducible...Ch. 9.3 - Prob. 16AYPCh. 9.4 - Explain the defining characteristics of a...Ch. 9.4 - Describe three forms of horizontal gene transfer...Ch. 9.5 - Prob. 19AYPCh. 9.5 - Prob. 20AYPCh. 9 - Prob. 1CFCh. 9 - What is the smallest unit of heredity? a....Ch. 9 - The nitrogen bases in DNA are bonded to the a....Ch. 9 - DNA replication is semiconservative because the...Ch. 9 - In DNA, adenine is the complementary base for...Ch. 9 - Transfer RNA is the molecule that a. contributes...Ch. 9 - Prob. 6MCQCh. 9 - The lac operon is usually in the _____ position...Ch. 9 - Prob. 8MCQCh. 9 - Prob. 9MCQCh. 9 - When genes are turned on differently under...Ch. 9 - The DNA pairs are held together primarily by...Ch. 9 - Prob. 12TFCh. 9 - Prob. 13TFCh. 9 - Prob. 14TFCh. 9 - Prob. 15TFCh. 9 - Explain the relationship among the following...Ch. 9 - Prob. 2CTQCh. 9 - On paper, replicate the following segment of DNA:...Ch. 9 - Provide evidence in support of or refuting the...Ch. 9 - Prob. 5CTQCh. 9 - Prob. 6CTQCh. 9 - Prob. 7CTQCh. 9 - Prob. 8CTQCh. 9 - Prob. 9CTQCh. 9 - Use your knowledge of DNA recombination events to...Ch. 9 - Prob. 1CCCh. 9 - Prob. 2CCCh. 9 - Prob. 3CCCh. 9 - Prob. 1VCCh. 9 - From chapter 4, figure 4.11a. Speculate on why...Ch. 9 - Concept Mapping | Blooms Level 6: Create Appendix...
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- Which of these BEST DESCRIBE tryptophan in the Trp Operon? A. Acts as a corepressor B. Acts as a coactivator C. Acts as an inducer D. Acts as an enhancerarrow_forwardOne strategy for producing a protein in the milk of a cow is toplace the coding sequence of the gene of interest next to a__________ and then inject the gene into a _________.a. lac operon promoter, cow oocyteb. β-lactoglobulin promoter, cow oocytec. lac operon promoter, cow mammary celld. β-lactoglobulin promoter, cow mammary cellarrow_forwardIf glucose is absent, but so is lactose, the lac operon will be ________. a. activated b. repressed c. activated, but only partially d. mutatedarrow_forward
- Prokaryotes are lacking in their DNA sequence. A. introns В. еxons. C. promoter sites D. operonsarrow_forwardTheara operon is an inducible operon that controls the production of the sugar arabinose. When arabinose is present in a bacterium it binds to the protein AraC, and the complex binds to the initiator site to promote transcription. In this scenario, AraC is a(n) ________. a. activator b. inducer c. repressor d. operatorarrow_forwardWhat do you call the site of activators that bind to the DNA molecule ? A. enhancer B. operon C. operator D. II E. Iarrow_forward
- In prokaryotes, the trp operon is under ________ that ________ prevents RNA polymerase from binding. a. negative regulation; biochemically b. negative regulation; physically c. positive regulation; biochemicallyarrow_forwardWhich of the following statements about the lac operon is correct? 1. lacZ, lacY and lacA proteins are translated using the same RNA molecule. 2. Lacl is a gene that codes for allolactose. 3. Allolactose activates transcription of lacz, lacY and lacA. 4. In the presence of lactose, the repressor is active. A. 1, 2 and 3 B. 1 and 3 C. 2 and 4 D. 4 only E. All of 1, 2, 3, and 4 are correct.arrow_forwardIn the trp operon, tryptophan is best characterized as being a: A. repressor B. inducer C. corepressor D. DNA-binding domainarrow_forward
- If tryptophan is presence in the culture media of E.coli then _________. the promoter will be accessed by the RNA polymerase the repressor will bind to the operator the structural genes of the trp operon will be expressed tryptophan will be synthesizedarrow_forwardPositive repressible means the regulatory protein is a(n) ______, and the operon is ______ when the signal is absent. Group of answer choices repressor; active repressor; inactive activator; inactive activator; activearrow_forwardWhich of the following molecules will experience a large change in cytoplasmic concentration whenthe above tryptophan operon is turned on (in E. coli cells)?A. tryptophan molecules will decrease in concentrationB. lactose molecules will decrease in concentrationC. tryptophan molecules will increase in concentrationD. lactose molecules will increase in concentrationE. none of the abovearrow_forward
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