Which of the following is NOT a DNA repair mechanism? a. base excision in which bulky...
Which of the following is NOT a DNA repair mechanism?
a. base excision in which bulky lesions are removed and replaced with the original nucleotides
b. direct repair of a modified base to the original structure
c. repair of mismatched bases to the original pair of nucleotides on opposite strands
d. replacement of nucleotides without the use of the complementary strand as a template
e. all of the above
Homework Answers
Ans) d is not a repair mechanism, it is referred to substitution which is a type of mutation that occurs on DNA which replaces nucleotide without the help of a comlementary strand. While the others namely option a refers to base excision repair wherein nucleotides are added by DNA polymerase after the removal of short stretch of damaged polynuceotides., option b refers to direct repair which are usually UV radiation mediated repair of nucleotides, option c refers to the mismatch repair which involves identificaton of mismatched pairs, determine the base which has been misatched and removal of the same followed by replacement of correct base pair.
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Which of the following is NOT a DNA repair mechanism?
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There is only ONE correct answer. Attached at the bottom is an information "Help" sheet that...
There is only ONE correct answer.
Attached at the bottom is an information "Help" sheet that
may or may not contain useful information
pertaining to this question.
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There is only ONE correct answer.
Attached at the bottom is an information "Help" sheet that
may or may not contain useful information
pertaining to this question.
19. The integrity of the genetic code relies on high-fidelity DNA replication, in which information in a template strand of DNA is transferred to the newly synthesized daughter strand (with A opposite T, and G opposite C). In class, we discussed the results of an experiment in which an unnatural thymine isostere called...
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DNA mismatch repair enzymes preferentially repair bases on the newly synthesized DNA strand, using the old DNA strand as the template. If mismatches were simply repaired without regard for which strand served as template, would this reduce replication errors? Explain your answer (5 pts) Describe DNA replication (remember to mention all the enzymes involved) (10 pts)
Each of the following statements about the structure of DNA may be either true or false. Choose the appropriate answer for each of these statements. Bonding between adenine and thymine on opposite strands involves two hydrogen bonds. Nitrogenous bases are located on the outside of the double helix: phosphates are located towards the middle of the double helix. Bonding between guanine and cytosine on opposite strands involves three hydrogen bonds. DNA and RNA are structurally different due to the difference...
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