Consider the following DNA sequence: 5' AAG TTC GGC TAT GCC AAC ACC 3' Which has been mutated to: 5' AAG TTC GGC TAT GCC GAC ACC 3' What mutation repair mechanism will the cell use to repair this mutation? Mismatch repair. Nucleotide excision repair. Homologous recombination. The cell cannot repair this type of mutation.
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Which DNA repair pathway deals with DNA damage that causes distortion? Mismatch repair Base excision repair Nucleotide excision repair Non-homologous end joining QUESTION 5 For homologous recombination to occur: Broken ends are fused together The cell must duplicate Cell needs a similar copy of undamaged DNA Base excision repair takes place
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DNA Repair Mechanisms Vertebrate and plant cells often methylate cytosine in DNA to form 5 -methylcytosine (see Fig. $8-5$ a). In these same cells, a specialized repair system recognizes G-T mismatches and repairs them to $\mathrm{G}=\mathrm{C}$ base pairs. How might this repair system be advantageous to the cell? (Explain in terms of the presence of 5-methylcytosine in the DNA.)
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