To say that there is a "proofreading" function in DNA replication means that the DNA polymerase will be eliminating an improper nucleotide if it develops extra and it will exchange it with the right nucleotide so there are very few mistakes.
A group of enzymes that form bonds between nucleotides during replication. What does it mean that replication has a "proofreading" function? It means that DNA polymerase will remove an incorrect nucleotide if it gets added and replace it with the correct nucleotide so there are very few errors.
