Final answer:
Incorrect base pairs can be correctly positioned for catalysis due to the alternate forms of the bases. Mismatch repair enzymes recognize and replace incorrectly added nucleotides, and nucleotide excision repair mechanisms remove and replace incorrect bases.
Step-by-step explanation:
During catalysis, incorrect base pairs can be correctly positioned due to the alternate forms of the bases. In DNA, the process of replication and repair involves enzymes that recognize and replace incorrect bases. For example, mismatch repair enzymes identify and excise incorrectly added nucleotides, which are then replaced by the correct base. Additionally, nucleotide excision repair mechanisms can remove incorrect bases and replace them with the correct ones. These processes help maintain the integrity of the DNA sequence.