In prokaryotes, nucleotide excision repair typically removes a DNA segment of what length before gap filling? 3-5 nucleotides 8-10 nucleotides 12-13 base pairs 27-30 nucleotides
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Step 1: The question asks about the typical length of a DNA segment removed during nucleotide excision repair (NER) in prokaryotes before gap filling occurs. Show more…
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All of the following statements about nucleotide excision repair (NER) are true EXCEPT: a) Provides the cell's ability to remove bulky lesions from DNA b) Repairs single strand breaks c) Removes many bases rather than a single altered base from the damaged strand d) Removes damage by recognition, incision, excision, repair synthesis and ligation.
Madhur L.
During nucleotide excision repair (NER), which of the following is true? a) removal of uracil base from the DNA strand b) recognition of the DNA distortion by the UvrAB complex c) unwinding of sister chromatid which is used as a template for the damaged strand d) hemi-methylated DNA is used to determine the correct base 2. Which are examples of damage found in DNA? a) phosphodiester strand breaks due to X-rays b) thymine-thymine dimers formed by UV radiation c) deamination of cytosine to uracil d) alkylating agents modifying a guanine
Which of the following statements about excision repair is correct? a. Base excision repair is initiated by DNA glycosylases that recognize abnormal deoxyriboses in DNA. b. Nucleotide excision repair removes large regions of DNA via an excinuclease which cuts on either side of the damaged bases. c. E. coli exonuclease activity is carried out by uvrA, uvrB, and uvrC, and the resulting gap is filled in by DNA Pol III. d. DNA glycosylases cleave the altered nucleoside (base and sugar) from the DNA backbone, creating an apurinic or apyrimidinic site. e. In humans, a mechanism similar to E. coli is carried out where the protein XPA acts as the exonuclease.
Shaiju T.
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