Answer:
2 and 5
Step-by-step explanation:
DNA replication occurs in S phase of cell cycle, is the process of DNA duplication in which one molecule of DNA is copied into two molecules. DNA is replicated by DNA polymerase enzyme which requires primer for initiation of replication. In leading strand, only one primer is required at the time of initiation, but for lagging strand, lots of primers are required, one at each okazaki fragment.
Telomere become short at each cell division because DNA polymerase requires a primer for DNA synthesis and DNA polymerase synthesizes DNA from the phosphate end to the hydroxyl end both the conditions are not filled at the telomeres.