Final answer:
Base excision repair cannot result in trinucleotide repeat expansions.
Step-by-step explanation:
False. Base excision repair (BER) is a DNA repair mechanism that fixes damage to a single nucleotide. It removes the damaged base with the help of glycosylase and replaces it with the correct base through repair synthesis with DNA ligase. Trinucleotide repeat expansions, on the other hand, refer to mutations that result in an increased number of copies of the same codon, leading to repeated regions of the same amino acid.