The video below explains how DNA replication occurs and the importance of telomere lengthening. As our telomeres shorten our cells will only replicate a certain number of times. Once they become to short our cells are no longer able to replicate, thus causing celluar senescence, or cell death. Telomerase acts as a bridge in the lengthening of telomeres that have already replicated.
You will see a very straightforward explanation in the video. The diagrams help those of us without the cellular biology background understand the process of Telomere Replication.
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