MICROBIOLOGY: FUNDAMENTALS CONNECT AC
3rd Edition
ISBN: 9781264669769
Author: Cowan
Publisher: MCG
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Chapter 8, Problem 7Q
Summary Introduction
Introduction:
An operon is a functioning unit of the genomic DNA containing a cluster of genes under the control of a single promoter. Operon occurs primarily in prokaryotes but also in some eukaryotes, it is made up of several structural genes arranged under a common promoter and regulated by common operator.
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Positive 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; active
. The tryptophan operon is usually in the _______position and is inhibited by a/an_______ molecule.
on, repressor
off, inducer
on, inducer
off, repressor
If glucose is absent, but so is lactose, the lac operon will be ________. a. activated b. repressed c. activated, but only partially d. mutated
Chapter 8 Solutions
MICROBIOLOGY: FUNDAMENTALS CONNECT AC
Ch. 8.1 - Define the terms genome and gene.Ch. 8.1 - Differentiate between genotype and phenotype.Ch. 8.1 - Draw a segment of DNA, labeling all important...Ch. 8.1 - Summarize the steps of bacterial DNA replication,...Ch. 8.1 - Compare and contrast the synthesis of leading and...Ch. 8.1 - Prob. 1NPCh. 8.2 - Provide an overview of the relationship among DNA,...Ch. 8.2 - Identify important structural and functional...Ch. 8.2 - Draw a picture of the process of transcription.Ch. 8.2 - List the three types of RNA directly involved in...
Ch. 8.2 - Prob. 10AYPCh. 8.2 - Identify the locations of the promoter, the start...Ch. 8.2 - Indicate how eukaryotic transcription and...Ch. 8.2 - NCLEX PREP 2. The following are all true of RNA,...Ch. 8.2 - Prob. 3NPCh. 8.3 - Define the term operon, and explain one advantage...Ch. 8.3 - Prob. 14AYPCh. 8.4 - Prob. 15AYPCh. 8.4 - Prob. 16AYPCh. 8.5 - Prob. 17AYPCh. 8.5 - Differentiate among frameshift, nonsense, silent,...Ch. 8.5 - Prob. 19AYPCh. 8.5 - Prob. 1MMCh. 8.6 - Explain the importance of restriction...Ch. 8.6 - List the steps in the polymerase chain reaction.Ch. 8.6 - Describe how you can clone a gene into a...Ch. 8.6 - Prob. 23AYPCh. 8.6 - Prob. 24AYPCh. 8.6 - Name two genetic techniques that are designed to...Ch. 8.6 - NCLEX PREF 4. A client is being treated with...Ch. 8.6 - Prob. 2MMCh. 8 - Single nucleotide polymorphisms are found in a....Ch. 8 - Using your knowledge of DNA from this chapter,...Ch. 8 - Conduct research on CRISPR and explain in...Ch. 8 - Which of the following is a characteristic of RNA?...Ch. 8 - List some advantages and disadvantages to a cell...Ch. 8 - Construct an argument for why tRNA contains a lot...Ch. 8 - Prob. 7QCh. 8 - Discuss the intersection between the metabolome...Ch. 8 - Defend this statement: All of biology is dependent...Ch. 8 - DNA is semiconservative because the ______ strand...Ch. 8 - Examine the DNA triplets here and determine the...Ch. 8 - Prob. 12QCh. 8 - Prob. 13QCh. 8 - Prob. 14QCh. 8 - Metagenomics is providing insight into the...Ch. 8 - The creation of biological molecules and cells...Ch. 8 - Prob. 17QCh. 8 - Genetically modified organisms (GMOs)especially in...Ch. 8 - Prob. 19QCh. 8 - Construct an analogy using your clothes closet to...Ch. 8 - Prob. 21QCh. 8 - Prob. 1VC
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- 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_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_forwardCan you please answer number 10 and all of the sub partsarrow_forward
- In the trp operon, tryptophan is best characterized as being a: A. repressor B. inducer C. corepressor D. DNA-binding domainarrow_forwardIf 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_forwardA mutation that inactivates the repressor gene of the lac operon results in (a) the continuous transcription of the structural genes (b) no transcription of the structural genes (c) the binding of the repressor to the operator (d) no production of RNA polymerase (e) no difference in the rate of transcriptionarrow_forward
- Theara 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_forwardHow would each manipulation of the leader region of the trp mRNA affect transcription of the E. coli trp operon? 1. Increasing the distance (number of bases) between the leader peptide gene and sequence 2 would ___________________ transcriptional attenuation of the trp operon. (increase/decrease/not change) 2. Increasing the distance between sequences 2 and 3 would ____________________ transcriptional attenuation of the trp operon. (increase/decrease/not change) 3. Removing sequence 4 would ________________ transcriptional attenuation of the trp operon. (cause/not change/prevent) 4. Changing the two Trp codons in the leader peptide gene to His codons would cause transcriptional attenuation of the trp operon to ____________________. (lose its sensitivity to histidine/increase its sensitivity to tryptophan/lose its sensitivity to tryptophan) 5. Eliminating the ribosome‑binding site for the gene that encodes the leader peptide would cause transcriptional attenuation of the trp operon to…arrow_forwardWhich 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_forward
- In the lac operon system, lactose is considered the ___________, and when the gene lacI is mutated such that the protein it produces cannot bind to lactose (IS mutation), the lac operon is ________. Group of answer choices repressor; never expressed activator; constitutively expressed inducer; never expressed inducer; constitutively expressed structural gene; never expressedarrow_forwardStudy the depiction of the lac operon in Figure 11.2. Normally, the genes are turned off when lactose is not present. Lactose activates the genes, which code for enzymes that enable the cell to use lactose. Mutations can alter the function of this operon. Predict how the following mutations would affect the function of the operon in the presence and absence of lactose: a. mutation of regulatory gene; repressor will not bind to lactose b. mutation of operator; repressor will not bind to operator c. mutation of regulatory gene; repressor will not bind to operator d. mutation of promoter; RNA polymerase will not attach to promoterarrow_forwardThe 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 mediumarrow_forward
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