Biology / Bio 1237 · Atom · ~20 seconds
Telomerase
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Telomerase is an enzyme carrying its own RNA template that extends a chromosome's telomeric repeats, countering the shortening lagging-strand synthesis causes.
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Telomerase adds repeat after repeat using its built-in RNA, then ordinary replication fills in the rest.
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Most human somatic cells make little or no telomerase, so their telomeres shorten across divisions — this states mechanism only, not a health claim.