Final answer:
RNA is used in DNA replication to synthesize Okazaki fragments, which are short stretches of DNA synthesized on the lagging strand.
Step-by-step explanation:
RNA is used in DNA replication in the synthesis of Okazaki fragments. Okazaki fragments are short stretches of DNA that are synthesized on the lagging strand of DNA, which is synthesized away from the replication fork. Each Okazaki fragment begins with a 5' RNA primer, which is then replaced with deoxynucleotides before the fragments are stitched together.