14. A type of DNA repair, in which a DNA glycosylase enzyme cleaves the bond between...
14. A type of DNA repair, in which a DNA glycosylase enzyme cleaves the bond between nucleotide's sugar and its attached base, is called ____.
Homework Answers
The answer is-
Base excision repair (BER)
The base excision repair (BER) is a method which is used by the cell to correct damaged DNA bases or single-strand DNA breaks. In this method of DNA repair, damaged bases are removed by an enzyme called DNA glycosylase which cleaves the bond between nucleotide's sugar and its attached base. The resulting apurinic/apyrimidinic (AP) sites are processed first by the Ape1 AP endonuclease, leaving a 5′ deoxyribose-phosphate; then by an AP lyase activity leaving a 3′-elimination product. The resulting single-strand breaks are then filled in by DNA polymerase followed by ligation.
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14. A type of DNA repair, in which a DNA glycosylase enzyme
cleaves the bond between...
1.Which of the following DNA repair systems involving DNA N-glycosylasesrecognizes an abnormal DNA nucleotide (i.e. uracil)...
1.Which of the following DNA repair systems involving DNA N-glycosylasesrecognizes an abnormal DNA nucleotide (i.e. uracil) and cleaves the bond between it and the sugar? - Mismatch repair -Base excision repair -Non-homologous end-joining repair -Homologous recombination repair 2. self-splicing is the most common mechanism for splicing mRNA transcribed from eukaryotic, nuclear, structural genes - true or false 3. True or False, during elongation of transcription, RNA polymerase is primarily in a closed complex
1. Which repair mechanism is most likely affected if the enzyme DNA glycosylase is not functioning...
1. Which repair mechanism is most likely affected if the enzyme DNA glycosylase is not functioning properly? photoreactivation repair base excision repair SOS repair double-strand break repair nucleotide excision repair 2. In bacteria and eukaryotes, a mutation is when ________. In bacteria and eukaryotes, a mutation is when ________. A.the nucleotide sequence in an mRNA molecule is directly changed B.the nucleotide sequence in a DNA molecule is directly changed C.the amino acid sequence in a protein molecule is directly changed...
Which DNA repair process begins with N-glycosylase reaction, followed by repair enzymes that excise one or...
Which DNA repair process begins with N-glycosylase reaction, followed by repair enzymes that excise one or more nucleotides at the abasic site? ► View Available Hint(s) mismatch repair systems O base excision repair O photoreactivation O Nucleotide excision repair Submit
Identify the various types of DNA repair mechanisms known to counteract the effects of UV radiation....
Identify the various types of DNA repair mechanisms known to counteract the effects of UV radiation. Recombinational repair Excision repair Photoactivation repair SOS repair 1. is dependent on a photon-activated enzyme that cleaves thymine dimers. 2. is the process by which an endonuclease clips out UV- induced dimers, DNA polymerase III fills in the gap, and DNA ligase rejoins the phosphodiester backbone. 3. uses the corresponding region on the undamaged parental strand of the same polarity. 4. is a process...
Funcions of the After Cas9 cleaves the DNA, cellular enzymes will attempt to repair the break....
Funcions of the After Cas9 cleaves the DNA, cellular enzymes will attempt to repair the break. Most of the time, these enzymes repair the DNA without errors. However, Cas9 will keep cutting the DNA at the same location until an error is made. 7. DNA repair errors include losing or inserting random nucleotides at the cut site. Explain how these changes might inactivate a gene. PART 2: Inactivating Genes in Butterflies Robert Reed, a biologist at Cornell University, wanted to...
This question is about DNA damage, repair and mutation. a) State a type of mutagen that...
This question is about DNA damage, repair and mutation. a) State a type of mutagen that could produce a single base pair substitution mutation. Briefly describe how this mutagen can produce single base pair substitution mutations. [4 marks] b) For your mutagen from (a), briefly describe the repair process that could repair the DNA damage. [4 marks] c) Propose how a single base pair substitution can be a hypomorphic allele. Explain how your mutation fits the definition of a hypomorphic...
Match the type of DNA lesion with its repair system. Note: Aflatoxin is produced by a...
Match the type of DNA lesion with its repair system. Note: Aflatoxin is produced by a mold that grows on crops, such as peanuts. Before FDA regulation, it used to be found at significant levels in peanut butter. The adduct is shown below: . HN HON NH d RIBOSE Uracil ✓ [Choose ] Nucleotide excision repair Mismatch repair Base excision repair The base pair resulting after a 5-methyl- cytosine deamination event Aflatoxin adduct [Choose]
Which statement is correct about DNA mutation and DNA repair? A. DNA mutation always leads to...
Which statement is correct about DNA mutation and DNA repair? A. DNA mutation always leads to an impaired protein function A Question Progress A B. All organisms have elaborate mechanisms to repair DNA damage C. DNA mutation is a temporary change in DNA sequence D. Environmental mutagens are safe and won't cause cancer E. Homologous recombination is a type of genetic recombination in which nucleotide sequences are exchanged between two totally different molecules of DNA Reset Selection
Which of the examples listed is not a DNA repair mechanism? direct repair base‑excision repair nucleotide‑excision...
Which of the examples listed is not a DNA repair mechanism? direct repair base‑excision repair nucleotide‑excision repair insertion sequence repair mismatch repair
Ul Ehé question paper. 1. Mutations can be caused by: a) tautomeric shifts b) UV light...
Ul Ehé question paper. 1. Mutations can be caused by: a) tautomeric shifts b) UV light c) chemical changes to bases such as deaminatior C) all the above 2. The start of a wild type mRNA was AUGCCCAAGAccA mu tation This type of change resulted in the sequence AUGUCCAAGACC. is called a a) missense一®.frameshift mutation. 3. The typical rate of mutation for a human gene is per generation. a) 103 c) 10 d) 10-11 e) 104 4. If a hypothetical...
Which DNA repair process begins with N-glycosylase reaction, followed by repair enzymes that excise one or more nucleotides at the abasic site? ► View Available Hint(s) mismatch repair systems O base excision repair O photoreactivation O Nucleotide excision repair Submit
Identify the various types of DNA repair mechanisms known to counteract the effects of UV radiation. Recombinational repair Excision repair Photoactivation repair SOS repair 1. is dependent on a photon-activated enzyme that cleaves thymine dimers. 2. is the process by which an endonuclease clips out UV- induced dimers, DNA polymerase III fills in the gap, and DNA ligase rejoins the phosphodiester backbone. 3. uses the corresponding region on the undamaged parental strand of the same polarity. 4. is a process...
Funcions of the After Cas9 cleaves the DNA, cellular enzymes will attempt to repair the break. Most of the time, these enzymes repair the DNA without errors. However, Cas9 will keep cutting the DNA at the same location until an error is made. 7. DNA repair errors include losing or inserting random nucleotides at the cut site. Explain how these changes might inactivate a gene. PART 2: Inactivating Genes in Butterflies Robert Reed, a biologist at Cornell University, wanted to...
Match the type of DNA lesion with its repair system. Note: Aflatoxin is produced by a mold that grows on crops, such as peanuts. Before FDA regulation, it used to be found at significant levels in peanut butter. The adduct is shown below: . HN HON NH d RIBOSE Uracil ✓ [Choose ] Nucleotide excision repair Mismatch repair Base excision repair The base pair resulting after a 5-methyl- cytosine deamination event Aflatoxin adduct [Choose]
Which statement is correct about DNA mutation and DNA repair? A. DNA mutation always leads to an impaired protein function A Question Progress A B. All organisms have elaborate mechanisms to repair DNA damage C. DNA mutation is a temporary change in DNA sequence D. Environmental mutagens are safe and won't cause cancer E. Homologous recombination is a type of genetic recombination in which nucleotide sequences are exchanged between two totally different molecules of DNA Reset Selection
Ul Ehé question paper. 1. Mutations can be caused by: a) tautomeric shifts b) UV light c) chemical changes to bases such as deaminatior C) all the above 2. The start of a wild type mRNA was AUGCCCAAGAccA mu tation This type of change resulted in the sequence AUGUCCAAGACC. is called a a) missense一®.frameshift mutation. 3. The typical rate of mutation for a human gene is per generation. a) 103 c) 10 d) 10-11 e) 104 4. If a hypothetical...
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