BIOL10005 Lecture Notes - Lecture 19: Micronucleus, Dinoflagellate, Apicoplast
31 Oct 2018
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Account for 10-15% of world"s (cid:272)ar(cid:271)o(cid:374) fixatio(cid:374) (cid:862)greatest produ(cid:272)er(cid:863) Has apical complex structure -> used to penetrate hosts. Remnant of chloroplast -> secondary symbiont that lost the ability to photosynthesize. Covered in short flagella, cilia -> motility, predation. Move by expanding its cytoplasm into pseudopods. Heterotrophs absorbs & engulf food after external digestion. Reproduce by spores in fruiting bodies called sorocarps. Cellular slime moulds feed on bacteria and decaying organic molecules. For most of the life cycle, slime moulds consist of single-celled amoebae. Under certain conditions, the amoebae aggregate -> form multi cellular structure (pseudoplasmodium) -> slugs (macroscopic) -> fruiting bodies -> spores -> . Could indicate the origin of multi cellular life forms. Superficially fungi, but more related to diatoms and brown algae. Zoospore infects plant tissue: hyphal filaments penetrate and parasitize cells. Zoospores with heterokont flagellae: one flagella is smooth , other is hairy.
