The enzyme telomerase adds DNA to the ends of chromosomes.Why would cancer cells express high levels of telomerase?

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Cancer cells need to divide rapidly and continuously to form a tumor. As telomeres get shorter with each cell division, normal cells eventually reach a point where they can no longer divide, which provides a natural barrier against uncontrolled cell growth. However, cancer cells can bypass this barrier by expressing high levels of telomerase, which allows them to maintain their telomeres and continue dividing indefinitely.

The Enzyme Telomerase Adds DNA to the Ends of Chromosomes