: crispr-cas9 may be used as a gene-editing tool to repair mutant genes (such as the gene that causes huntington's disease in humans). this technique has been used in bacteria, mice, and even human embryos. first, crispr-cas9 is used to target and remove the mutant gene. second, naturally occurring repair enzymes will add the wild-type gene into the gap left from the site where the mutant gene was removed. which of these bacterial repair mechanisms would most likely be responsible for repairing the dna when used to edit bacterial genes? choose one: a. nucleotide excision b. methyl mismatch repair c. base excision d. umudc translesion bypass synthesis in sos e. reca recombination repair

However, some DNA lesions can be directly reversed, which may be a more effective method of handling some types of DNA damage that happen frequently.

The three major types of polymerases found in prokaryotes are known as DNA pol I, DNA pol II, and DNA pol III. DNA pol III is now understood to be the enzyme needed for DNA synthesis, whereas DNA pol I and DNA pol II are mainly needed for repair.

In order for the cells to repair the DNA damage, at least five major DNA repair pathways—base excision repair (BER), nucleotide excision repair (NER), mismatch repair (MMR), homologous recombination (HR), and non-homologous end joining (NHEJ)—are active at various times during the cell cycle.

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