<prompt> Pneumocystis carinii is a fungus because ?rRNA, mitochondrial protein gene sequence presence of thymidylate synthaseCell wall contains glucansAngifungals are effective against P. cariniAll  <response>: Ans. is a i.e., rRNA, Mitochondrial protein gene sequence presence thymidylate synthase; b i.e., Cell wall contains glucans; c i.e., Antifungals are effective against p. carinii . The taxonomic classification of Pneumocystis as a fungus is based on factors: 1. Analysis of gene sequence for ribosomal RNA, mitochondria! proteins and major enzymes. 2. Presence of b-1, 3 glucan in the cell wall. 3. The efficacy of antifungal drugs that inhibit b-glucan synthesis. . In contrast to most fungi. 1. Pneumocystis lacks ergosterol 2. Not susceptible to antifungal drugs that inhibit ergosterol synthesis. 