Which of the statements about replication error and repair during DNA synthesis are true? Please select all that apply.

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Bases can exist as tautomers, which increases the likelihood that they will pair with the incorrect base, i.e., non-Watson-Crick base pairing. The replication error rate is low, at 0.0001-0.001% of bases, but this error rate is lowered approximately 1000-fold with the addition of proofreading. DNA polymerases with proofreading activity can remove the last nucleotide at the 3' end of the DNA strand - this is 3' exonuclease activity (endonucleases are enzymes that cut DNA in the middle of the strand)

Which of the Statements About Replication Error and Repair During