DNA sequences. Telomerase recognizes the repeated sequence, binds to it, and then lays down more nucleotides, lengthening the telomere. Telomerase is composed of amino acids and RNA nucleotides. In the image above the amino acids are represented by the half circle shape, and the nucleotides of telomerase are represented in blue. 1. The RNA nucleotides part of the telomerase structure is used as the for creating the repeated sequence at the end of chromosomes. 2. What end of the DNA is telomerase extending? 3. What does this extension accomplish? 4. Why don't organisms with circular chromosomes also have telomerase?.