Extreme UV exposure leads to the SOS response in bacteria. By what mechanism does the SOS response function? Answer choices induction of photolyase and the addition of white light to remove the thymine dimer destruction of lexA, which leads to expression of an alternate, error-prone DNA polymerase homologous recombination repair non-homologous end joining exinuclease removal of a segment of DNA including a thymine dimer, followed by the replacement of DNA using the complementary strand of DNA

Extreme UV exposure leads to the SOS response in bacteria. By what mechanism does the SOS response function? Answer choices induction of photolyase and the addition of white light to remove the thymine dimer destruction of lexA, which leads to expression of an alternate, error-prone DNA polymerase homologous recombination repair non-homologous end joining exinuclease removal of a segment of DNA including a thymine dimer, followed by the replacement of DNA using the complementary strand of DNA

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Description: Extreme UV exposure leads to the SOS response in bacteria. By what mechanism does the SOS response function?Answer choicesinduction of photolyase and the addition of white light to remove the thymine dimer destruction of lexA, which leads to expressi

Biochemistry

6th Edition

ISBN:9781305577206

Author:Reginald H. Garrett, Charles M. Grisham

Publisher:Reginald H. Garrett, Charles M. Grisham

Chapter28: Dna Metabolism: Replication, Recombination, And Repair

Section: Chapter Questions

Problem 10P: Homologous Recombination, Heteroduplex DNA, and Mismatch Repair Homologous recombination in E. coli...

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A pyrimidine dimer which is a bulky lesion has mutated an E. coli cell's DNA. Describe both the photoreactivation enzyme repair (PRE) and Nucleotide excision repair describe how the cell uses Uvr A, B, C, D gene products to effect repair.
You are studying tumor cells excised from a patient with suspected Colorectal cancer and you will like to evaluate the status of the DNA repair mechanisms in the tissues. Which of these will be helpful in estimating the functional status of the DNA repair mechanisms in this tissue? Group of answer choices Monoubiquitinated FANCD2 protein PhosphorylatedDNA-PK DNA-damage induced foci All of these
Identify the various types of DNA repair mechanisms known to counteract the effects of UV radiation. Drag the terms on the left to the appropriate blanks on the right to complete the sentences. Reset Help SoS repair is dependent on a photon-activated enzyme that cleaves thymine dimers. excision repair is the process by which an endonuclease clips out UV-induced dimers, DNA photoreactivation repair polymerase III fills in the gap, and DNA ligase rejoins the phosphodiester backbone. recombinational repair uses the corresponding region on the umdamaged parental strand of the same polarity. is a process in E. coli that induces error-prone DNA replication in an effort to fill gaps by inserting random nucleotides.
Cytosine can be deaminated to form Uracil What type of mutation is this classified as? Discuss what happens to the base-pairing properties from switching from C to U? When U is replicated in two rounds of synthesis, what substitution does this result in? Before Uracil alters the DNA during replication, what repair system can be used to correct this error? Describe how this type of DNA repair works?
All are correct about DNA gyrase in E. coli EXCEPT: It works to remove positive supercoiling introduced by the DnaB protein (helicase). It is a topoisomerase that hydrolyzes ATP during its reaction mechanism. Its mechanism involves the breaking of a single phosphoester bond in one strand of dsDNA. It works to relieve supercoiling in DNA to overcome the torsion stress imposed upon unwinding.
Tripartite motif-containing protein 5a or TRIM5a is a cellular antiviral restriction factor. Briefly describe the mechanism that prevents early replication events
Ultraviolet light can cause covalent linkages between consecutive pyrimidine bases in DNA (up to 100 per second in a single cell in sunlight!). These bulky lesions (i.e. cyclobutane pyrimidine dimers and 6-4 photoproducts), which inhibit DNA and RNA polymerases, are mostly reversed by CPD photolyase when light >300 nm is available to power the reaction. In the dark, however, which DNA repair system is best able to correct these errors? a) non-homologous end-joining b) mismatch repairc) nucleotide-excision repaird) base-excision repair e) homology-directed repair
From standpoint of replication and transcription, explain how RNA polymerase is allowed to incorporate the first nucleotide whereas DNA polymerase needs a primer. Explain how this difference impacts the process of replication and transcription.
The anti-viral drug Acyclovir is a nucleotide analog that is lacking the 3’ OH group which is required to form a 3’→5’ phosphodiester bond. This drug is ineffective against DNA polymerases with proofreading abilities, which is why human DNA polymerases are not targeted. Acyclovir can be used to treatsevere cases of Epstein-Barr viral (EBV) infection, but has little to no effect under non-severe infections. Based on this information, EBV will use ________ DNA polymerase during severe infections and __________ DNA polymerase during non-severe infections. Human; Human EBV; Human EBV; EBV Human; EBV
DNA polymerase I, DNA ligase, and topoisomerase I catalyze the formation of phosphodiester bonds. What is the activated intermediate in the linkage reaction catalyzed by each of these enzymes? What is the leaving group?
The 3′ → 5′ exonuclease activity of Pol I excises only unpaired 3′-terminal nucleotides from DNA, whereas this enzyme’s pyrophosphorolysis activity removes only properly paired 3′-terminal nucleotides. Discuss the mechanistic signifi cance of this phenomenon in terms of the polymerase reaction.
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…