Is telomerase a ribozyme?

Yes, telomerase is a ribozyme. Telomerase is an RNA-containing enzyme that has a catalytic RNA component in addition to a protein component. The RNA component serves as a template for the addition of repetitive DNA sequences to the telomere ends, allowing telomerase to extend telomeres. This RNA-based mechanism classifies telomerase as a ribozyme, an enzyme whose activity is based on its RNA component rather than a protein.