Multiple choice Which among the following is a large class of self-catalytic ribozymes? Group I introns Group II introns Twintrons LtrA Spliceosome Reveal answer Fill a bubble to check yourself B Correct answer Explanation Group II introns is a large class of self-catalytic ribozymes as well as mobile genetic element found within the genes of all three domains of life. Ribozyme activity (e.g., Self-splicing) can occur under high-salt conditions in vitro.