Main Page | See live article | Alphabetical index Telomerase is an biochemical enzyme that adds telomere repeat sequences (AAUCCC in mammals) to the 5' ("five prime") end of DNA strands. By lengthening the strand before replication, cells with active telomerase catalytic activity are able to compensate for telomere shortening during DNA replication. Telomerase classifications: a ribonucleoprotein a reverse transcriptase This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.