In the context of DNA repair and replication fidelity, how does DNA polymerase help prevent mutations during DNA synthesis?

Human DNA cut with restriction enzyme A can be joined to which of the following DNA fragments?

In DNA repair pathways, DNA repair enzymes most directly use which of the following as their substrate?

In DNA replication, which mechanism primarily helps prevent errors by removing misincorporated nucleotides during DNA synthesis?

In the context of DNA repair during replication, which mechanism most directly helps prevent errors in DNA replication by removing misincorporated nucleotides as DNA is being synthesized?

In the context of DNA repair, which vitamin is most directly required as a cofactor for thymidylate synthase to support nucleotide synthesis during DNA replication and repair?

In the context of DNA repair and genome stability, which vitamin is most directly associated with supporting DNA synthesis and repair by providing one-carbon units for nucleotide production and methylation reactions?