Telomerase is a special DNA polymerase that
- A
Cleaves DNA at telomeric repeat sequences during chromosome condensation
- Bcheck_circle
Extends telomeres at chromosome ends, using its own RNA as a template
- C
Replicates circular plasmid DNA in bacterial cells, using a DNA template
- D
Synthesizes mRNA transcripts from telomeric DNA, using ribonucleotides
Explanation
Telomerase contains an RNA template; without it, chromosomes shorten with each replication. Active in stem cells, germ cells, and most cancers.