Genetics: Analysis and Principles
6th Edition
ISBN: 9781259616020
Author: Robert J. Brooker Professor Dr.
Publisher: McGraw-Hill Education
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Chapter 19, Problem 38CONQ
Summary Introduction
To review:
The differences and similarities between mismatch repair and NER (
Introduction:
DNA (deoxyribonucleic acid) forms the genetic material of cells. When this DNA gets mutated, it could lead to changes which might be harmful to the cell. In order to repair these mutations, there are DNA repair systems in a cell.
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Discuss the similarities and differences between nucleotide excisionrepair and the mismatch repair system.
Explain why base excision repair, nucleotide excision repair, and mismatch repair—which all require nucleases to excise damaged DNA—require DNA ligase.
Provide a detailed description and hand drawn figure of each of the following.
(1) Mismatch Repair
(2) Nucleotide-Excision Repair
Chapter 19 Solutions
Genetics: Analysis and Principles
Ch. 19.1 - 1. A mutation changes a codon that specifies...Ch. 19.1 - A down promoter mutation causes the promoter of a...Ch. 19.1 - 3. A mutation in one gene that reverses the...Ch. 19.1 - Which of the following is an example of a somatic...Ch. 19.2 - Prob. 1COMQCh. 19.3 - Which of the following is not an example of a...Ch. 19.3 - A point mutation could be caused by a....Ch. 19.3 - One way that TNRE may occur involves the formation...Ch. 19.4 - Nitrous acid replaces amino groups with keto...Ch. 19.4 - Prob. 2COMQ
Ch. 19.4 - Prob. 3COMQCh. 19.5 - The function of photolyase is to repair a....Ch. 19.5 - Which of the following DNA repair systems may...Ch. 19.5 - 3. In nucleotide excision repair in E. coli, the...Ch. 19.5 - Prob. 4COMQCh. 19.5 - An advantage of translesion-replicating...Ch. 19 - Is each of the following mutations a transition,...Ch. 19 - Prob. 2CONQCh. 19 - What does a suppressor mutation suppress? What is...Ch. 19 - Prob. 4CONQCh. 19 - X-rays strike a chromosome in a living cell and...Ch. 19 - Prob. 6CONQCh. 19 - Prob. 7CONQCh. 19 - 8. A point mutation occurs in the middle of the...Ch. 19 - Prob. 9CONQCh. 19 - Prob. 10CONQCh. 19 - 11. Is a random mutation more likely to be...Ch. 19 - 12. Which of the following mutations could be...Ch. 19 - Prob. 13CONQCh. 19 - Discuss the consequences of a germ-line versus a...Ch. 19 - Prob. 15CONQCh. 19 - Explain how a mutagen can interfere with DNA...Ch. 19 - What type of mutation (transition, transversion,...Ch. 19 - Explain what happens to the sequence of DNA during...Ch. 19 - Distinguish between spontaneous and induced...Ch. 19 - Prob. 20CONQCh. 19 - Prob. 21CONQCh. 19 - Prob. 22CONQCh. 19 - Trinucleotide repeat expansions (TNREs) are...Ch. 19 - 24. With regard to TNRE, what is meant by the term...Ch. 19 - 25. What is the difference between the mutation...Ch. 19 - Achondroplasia is a rare form of dwarfism. It is...Ch. 19 - Prob. 27CONQCh. 19 - In the treatment of cancer, the basis for many...Ch. 19 - Prob. 29CONQCh. 19 - 30. Which of the following examples is likely to...Ch. 19 - Prob. 31CONQCh. 19 - Prob. 32CONQCh. 19 - Prob. 33CONQCh. 19 - With regard to the repair of double-strand breaks,...Ch. 19 - Prob. 35CONQCh. 19 - Prob. 36CONQCh. 19 - 37. Three common ways to repair changes in DNA...Ch. 19 - Prob. 38CONQCh. 19 - Prob. 39CONQCh. 19 - Explain how the technique of replica plating...Ch. 19 - 2. Outline how you would use the technique of...Ch. 19 - 3. From an experimental point of view, is it...Ch. 19 - Prob. 4EQCh. 19 - Prob. 5EQCh. 19 - 6. Richard Boyce and Paul Howard-Flanders...Ch. 19 - In E. coli, a variety of mutator strains have been...Ch. 19 - 2. Discuss the times in a person’s life when it is...Ch. 19 - A large amount of research is aimed at studying...
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- What is/are the attributes that make nucleotide excision repair (NER) and base excision repair (BER) similar and/or different from each other? Select the correct response: The NER pathway is the only one that can remove DNA lesions in the strand regardless of their size which is followed by attaching the correct strand, then sealed by a DNA ligase. They both use the enzyme DNA glycosylases that recognizes the damaged DNA segments and proceed with repairing the faulty base in the strand. They differ NER only repairs purine bases while BER repairs pyrimidine bases. They both remove the damaged parts of the DNA where the BER pathway corrects only the identified damaged bases which are usually non-bulky lesions. The NER pathway, on the other hand, repairs the damage by removal of bulky DNA adducts which is a short-single stranded DNA segment. They both utilize the enzyme photolyase to reverse the damages created by the faulty section of the DNA. They both remove the damaged parts of the…arrow_forwardHow is mismatch repair different from excision repair (in terms of what type of mutation it is used for and how the events proceed)?arrow_forwardDescribe the excision repair process in DNA, using the excision of thymine dimers as an example.arrow_forward
- There are two types of excision repair, base excision repair (BER) and nucleotide excision repair (NER). Which enzymes are used in Base excision repair in E. coli?And In nucleotide excision repair, what kind of damage is repaired by this mechanism and why are cutsmade on both sides of the damaged region of DNA?arrow_forwardWhat are the essential differences between base excision repair and nucleotide excision repair and what types of DNA damage are they dedicated to repairing?arrow_forwardWhich of the following statements regarding Nucleotide Excision Repair (NER) and Base Excision Repair (BER) is true? Only NER involves the action of DNA ligase to seal nicks in the DNA backbone. Both NER and BER involve DNA strand cleavage by an endonuclease. Both NER and BER can be activated by exposure to visible light. Only BER requires DNA polymerase. Both NER and BER involve the creation of an apyrimidinic (AP) site.arrow_forward
- Match the bold DNA repair response(s) to the triggering type of DNA damage. Homologous Recombination Mishmatch Repair Base Excision Repair Nucleotide Excision Repair Non-homologous End Joining Single-strand DNA breaks Removal of repair lesions such as photoproducts caused by UV including Thymine dimers Double-Strand Break repair mechanism which is an accurate repair mechanism without any introduction of insertions or deletions. It requires a sister chromatid as a template. This repair mechanism uses just DNA glycosylase to remove Uracil (no other enzymes or complexes are required) then DNA polymerase can use the template stand to add the complementary base where the Uracil has been removedInterstrand Crosslink Repair This repair mechanism is used to recognize and repair mis-incorporation of base that can arise during DNA replication. Removal and replacement of modifying bases such as Uracil, 8-hyroxyguanine and others. Double-strand Break that is termed as “Quick and Dirty” as it is…arrow_forward"The mechanism does not recruit a homologous region of DNA during repair". Explain this ?arrow_forwardMatch the DNA repair mechanism to the type of repair it fixes. Base excision repair DNA polymerase proofreading Non-homolgous end-joining Mismatch repair Nucleotide excision repair Double strand breaks Mismatches in S-phase Mismatches after S-phase, before M-phase Mismatches in interphase Thymidine Dimer Double strand breaks Mismatches in S-phase Mismatches after S-phase, before…arrow_forward
- Which of the following DNA repair processes is known to be "error-prone" (i.e. resulting in incorporation of incorrect nucleotides as part of the repair process)? Mark all the answers that are correct. post-replication repair Nucleotide Excision Repair (NER) M non-homologous end-joining of double-stranded DNA breaks. SOS-response O Base Excision Repair (BER)arrow_forwardWhich of the following statements regarding Nucleotide Excision Repair (NER) and Base Excision Repair (BER) is true? Only NER involves the action of DNA ligase to seal nicks in the DNA backbone. Both NER and BER involve the creation of an apyrimidinic (AP) site. Both NER and BER involve a single DNA strand cleavage by an endonuclease. Only BER requires DNA polymerase. Both NER and BER can be activated by exposure to visible light.arrow_forwardDNA repair enzymes preferentially repair mis- matched bases on the newly synthesized DNA strand, using the old DNA strand as a template. If mismatches were instead repaired without regard for which strand served as template, would mismatch repair reduce repli- cation errors? Would such a mismatch repair system result in fewer mutations, more mutations, or the same number of mutations as there would have been without any repair at all? Explain your answers.arrow_forward
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