Brock Biology of Microorganisms (15th Edition)
15th Edition
ISBN: 9780134261928
Author: Michael T. Madigan, Kelly S. Bender, Daniel H. Buckley, W. Matthew Sattley, David A. Stahl
Publisher: PEARSON
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Textbook Question
Chapter 12.3, Problem 1MQ
- How can the bacteriophage T7 promoter be used to control expression of a eukaryotic gene in Escherichia coli?
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How can the bacteriophage T7 promoter be used to controlexpression of a eukaryotic gene in Escherichia coli?
What is the phenotype of an E. coli strain with a mutation in the lac operator that allows the lac repressor to irreversibly bind the operator? Assume glucose is absent.
1S
A) O Transcription of the operon is very high whether lactose is present or not.
B) O Transcription of the operon is very low whether lactose is present or not.
C) O Transcription of the operon is high in the presence of lactose, and low in its absence.
D) O Transcription of the operon is low in the presence of lactose, and high in its absence.
Figure 5 shows the lac operon structure in Escherichia coli.
a) Name structures P, Q and R.
b) Name substance S.
c) What is the enzyme encoded by gene I. Give its function.
d) What will happen if substance S is absent in the medium?
Chapter 12 Solutions
Brock Biology of Microorganisms (15th Edition)
Ch. 12.1 - Why is a primer needed at each end of the DNA...Ch. 12.1 - How does RT-PCR differ from traditional PCR?Ch. 12.1 - Prob. 3MQCh. 12.1 - Describe the basic principles of gene...Ch. 12.2 - What is the purpose of molecular cloning?Ch. 12.2 - Prob. 2MQCh. 12.2 - Prob. 3MQCh. 12.2 - Prob. 1CRCh. 12.3 - How can the bacteriophage T7 promoter be used to...Ch. 12.3 - What major advantage does cloning mammalian genes...
Ch. 12.3 - Prob. 3MQCh. 12.3 - Prob. 1CRCh. 12.4 - How can site-directed mutagenesis be useful to...Ch. 12.4 - What is used to alter more than a few base pairs...Ch. 12.4 - What are knockout mutations?Ch. 12.4 - What does site-directed mutagenesis allow you to...Ch. 12.5 - What is a reporter gene? The product of which...Ch. 12.5 - Prob. 2MQCh. 12.5 - Describe two widely used reporter genes.Ch. 12.6 - Prob. 1MQCh. 12.6 - Prob. 2MQCh. 12.6 - Prob. 3MQCh. 12.6 - Prob. 1CRCh. 12.7 - Prob. 1MQCh. 12.7 - Give an example of a genetically modified plant...Ch. 12.7 - How have transgenic salmon been engineered to...Ch. 12.7 - What is the Ti plasmid and how has it been of use...Ch. 12.8 - Explain why recombinant vaccines might be safer...Ch. 12.8 - Prob. 2MQCh. 12.8 - Prob. 3MQCh. 12.8 - What is a subunit vaccine and why are subunit...Ch. 12.9 - Explain why metagenomic cloning gives large...Ch. 12.9 - What types of environments are often sampled to...Ch. 12.9 - Prob. 3MQCh. 12.9 - How has metagenomics been used to find novel...Ch. 12.10 - How has Caldicellulosiruptor been modified to...Ch. 12.10 - Prob. 2MQCh. 12.10 - What has been the limiting factor in engineering...Ch. 12.10 - Prob. 1CRCh. 12.11 - What are biobricks?Ch. 12.11 - Prob. 2MQCh. 12.11 - How was Escherichia coli modified to produce a...Ch. 12.11 - Prob. 1CRCh. 12.12 - Prob. 1MQCh. 12.12 - Prob. 2MQCh. 12.12 - How is recombinant DNA inserted into a genome...Ch. 12.12 - How has the CRISPR editing technology been applied...Ch. 12.13 - Prob. 1MQCh. 12.13 - How can a tRNA be engineered to encode for a...Ch. 12.13 - Prob. 3MQCh. 12.13 - What are some mechanisms for controlling a...Ch. 12 - Suppose you have just determined the DNA base...Ch. 12 - Prob. 2AQCh. 12 - Prob. 3AQCh. 12 - Describe how you could recode Escherichia coli to...
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- What would happen if the operator sequence of the trp operon contained a mutation that prevented the repressor protein from binding to the operator? (Explain what would happen in both the presence and absence of tryptophan)arrow_forwardM13 is a filamentous phage that infects the bacterium Escherichia coli. Infection with M13 is not lethal. However, the infection causes turbid plaques in E. coli because infected bacteria grow slower than the surrounding uninfected bacteria. This phage has been engineered to act as a vector system. Explain how the amplification of gene of interest works in this phage with illustration.arrow_forwardA newly identified protein from the cells of the Panopyra plant on Pandora was shown to inhibit translation of its target genes by binding to the 5’ UTR of the mRNA and preventing ribosome binding. A possible way this inhibition may be relieved by an sRNA would be: Group of answer choices a)The sRNA acts as a silencer, suppressing the inhibitory protein and allowing translation to take place. b)The sRNA acts as a decoy, sequestering the inhibitory protein and allowing translation to take place. c)The sRNA acts as a marker, flagging the inhibitory protein for ubiquitination and allowing translation to take place.arrow_forward
- How long would it take for the E. coli RNA polymerase to synthesize the primary transcript for the E. coli genes encoding the enzymes for lactose metabolism, the 5,300 bp5,300 bp lac operon? Assume an average elongation rate of 7070 nucleotides per second. a)How far along the DNA would the transcription "bubble" formed by RNA polymerase move in 10 seconds10 seconds? b)Assuming that human Pol II transcribes at a similar rate, how long does it take to transcribe the 2,000,000 bp2,000,000 bp dystrophin gene?arrow_forwardThe lac operon contains the genes that the bacterium needs to be able to use lactose as a carbon source. What would happen to the regulation of the Lac operon if: a) a mutation has occurred in the Lac Z gene which results in the formation of no functional β-galactosidase b) a mutation has occurred in the CAP protein so that cAMP cannot bindarrow_forwardThe streptolysin S toxin made by S. pyogenes is encoded by a 9-gene operon, sagABCDEFGHI. Thinking about what a 3-line diagram would look like for this operon, answer the following questions. Write numeric answers only. For example, if your answer is 6 promoters, write only 6. 1) How many promoters control the expression of these genes? 2) How many locations does RNA Polymerase bind to get full expression of these genes? 3) How many ribosome binding sites are needed for full protein expression? 4) How many start codons will be needed for full protein expression? 5) How many mRNA strands will be produced with full operon expression? 6) How many proteins will be produced with full protein expression? 1arrow_forward
- Gene expression in bacteria is controlled by the operon model. a) Why is the operon model important? b) Why is the trp operon known as a repressible operon?arrow_forwardA number of mutations affect the expression of the lac operon in E. coli. The genotypes of several E. coli strains are shown below. ("+" indicates a wild-type gene with normal function and "-" indicates a loss-of-function allele.) Please predict which of the following strains would have the highest beta-galactosidase enzyme activity, when grown in the lactose medium. O CAP+ r* p* o* z O CAP* I P* o* z* O CAP* r* P O* z* O CAP I P* O z*arrow_forwardGiven the following genotypes, explain, by answering the questions in each number, how the mutation (identified by a (-) superscript) will affect E. coli grown in lactose medium. Will there be a complete set ofgene products? (Yes/No) Will the lac operon be turnedon/off? Will the cell survive? (Yes/No) a. i + p + o + z - y + b. i + p - o + z + y + c. i + p + o - z + y +arrow_forward
- The lac operon consists of three structural genes, lacZ, lacY and lacA that are transcribed as a single polycistronic mRNA. You are given a new strain of Escherichia coli with the following lac operon genotype: p+0°Z•Y*A +// P*O*Z*Y+ A- (i) Explain how the lac I ³ gene affects gene expression.arrow_forwardThe lac operon consists of three structural genes, lacZ, lacY and lacA that are transcribed as a single polycistronic mRNA. You are given a new strain of Escherichia coli with the following lac operon genotype: p+0°Z•Y*A +// P*O*Z*Y+ A- (i) Explain how the lac I gene affects gene expression. (ii) Explain the function of the lacP in the bacterial operon. (iii) Which part of the lac operon is cis-dominant? Explain.arrow_forwardaarrow_forward
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