What is the primary purpose of telomeres in chromosomes?

Telomeres serve an essential role in maintaining the integrity of chromosomes by preventing the ends from degrading or sticking together, which can lead to chromosomal instability. These structures consist of repetitive DNA sequences that are added to the ends of chromosomes, effectively acting as protective caps. As cells divide, telomeres gradually shorten; when they become too short, the cell can no longer divide properly, which can lead to cellular aging and senescence.

This protective function is crucial because if chromosome ends were to fray or adhere to one another, it could result in the loss of genetic information or chromosomal rearrangements, ultimately impacting the health and functionality of cells. Therefore, the primary purpose of telomeres is indeed to prevent chromosome ends from sticking and fraying, preserving genetic information during cell division.