Microbiology: An Evolving Science (Fourth Edition)
4th Edition
ISBN: 9780393615098
Author: John W. Foster, Joan L. Slonczewski
Publisher: W. W. Norton & Company
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Chapter 11, Problem 2RQ
Summary Introduction
To review:
The role of CI repressor and Cro protein in the lysogenic and lytic cycle.
Introduction:
A bacteriophage is the type of virus that especially infects the bacteria and this virus follows two cycles to reproduce into bacteria, lytic cycle and lysogenic cycle. In the lytic cycle, the phage undergoes replication and causes the lysis of the host cell while in the lysogenic cycle phage, the DNA is absorbed into the host genome and passes onto the upcoming generations.
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Check out a sample textbook solutionStudents have asked these similar questions
Which will be bound to the Lac Operon in an environment with lactose and glucose?
A) both repressor and CAP
B) repressor only
C) CAP only
D) neither repressor nor CAP
What is the difference between a prophage and a Lysogen?
what is the nature and likely location(s) of a mutant that would,
1)allow constitutive expression of the lac gene?
2)prevent the cell from responding to lactose ( genes are not induced when exposed to lactose)?
3) not allow the cell to utilize lactose even when the genes are induced
Chapter 11 Solutions
Microbiology: An Evolving Science (Fourth Edition)
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- What is the function of the repressor encoded by the lacI gene?arrow_forwardWhat is a possible outcome of the addition of a transcription factor such as Myod to the nucleus of a cell? Assume that there are no other factors to either activate or prevent the response of the cell. Group of answer choices A) Production of mRNA from genes that were previously not expresed B)adding methyl groups to DNA C)prevention of protein synthesis D)uncoiling of the chromatin to allow transcriptionarrow_forwardThe lactose operon is likely to be transcribed when _____. A) there is more glucose in the cell than lactose B) there is glucose but no lactose in the cell C) the cAMP level is high and the lactose level is low D) the cyclic AMP and lactose levels are both high within the cellarrow_forward
- When taken up by a cell, which of the following molecules binds to a repressor so that the repressor no longer binds to the operator? a) inducer b) promoter c) repressor d) corepressorarrow_forwardWhat are the exact factors that can cause Post transcriptional modification of cytoskeletal protiens and what is its effect on the dynamics of cytoskeletal protien.arrow_forwardHow does the tryptophan operan turn back on in gene regulation?arrow_forward
- Gene Expression: 14) Look at the diagram: a) For each of the molecules in the diagram, identify what type of molecule they are, and label their ends (3',5',N,C). b) For each arrow, name the process and identify the major enzymes involved. c) Where do each of these activities take place in a bacterial cell? In a eukaryotic cell? Draw a picture if it helps you explain it.arrow_forwardCertain environmental conditions such as exposure to UV light areknown to activate lysogenic λ prophages and cause them to progressinto the lytic cycle. UV light initially causes the repressor protein to be proteolytically degraded. Make a flow diagram showing the subsequent events that lead to the lytic cycle. (Note: The xis gene codes for an enzyme that is necessary to excise the λ prophage from the E. coli chromosome. The enzyme integrase is also necessary for this excision.)arrow_forwardDescribe how one might determine which proteins in E.coli are repressed when a culture is shifted from a minimal medium to a rich medium containing many amino acids, bases and vitamins. How might one study which genes are expressed during each growth condition?arrow_forward
- Most bacterial repressor proteins are allosteric. Which of the following binds with the repressor to alter its conformation? A) promoter B) corepressor C) ATParrow_forwardThe choice between lysogeny and lysis is influenced by many factors. How would external conditions such as starvation or crowding be “sensed” and communicated to the transcriptional machinery and influence this choice?arrow_forwardWhich reaction normally happens in the regulation of the trp operon when high levels of tryptophan are present?arrow_forward
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