FDSC 2000 Chapter : Chapter 5 Part 2
Document Summary
Symbiotic relationship close interaction between species in which one species lives in or on the other. Viruses, viroids, and prions are smaller than prokaryotes, are not living organisms. All viruses have a genome and capsid; some also have an envelope. Function of virus: take control of host cell to produce more virus particles. Viroid small fragment of single-stranded rna (ssrna); no protein coat; same function as virus; infect plants. Prion protein particles; no genetic material; improperly folded version of normal proteins. Old grouping of protists (based on nutrition: plant-like = autotrophic (photosynthesis, example: phytoplankton or algae, fungus-like = heterotrophic (decomposers, animal-like = heterotrophic (hunters and symbiotic, example: protozoans. Excavates: flagella, feeding groove, heterotrophic, lack mitochondria. Diplomonads: free-living or symbiotic, two nuclei, multiple flagella, ex: giardia (caused by drinking contaminated water, causes diarrhea) Parabasalids: anaerobic, symbiotic or parasitic, ex: trichomanas vaginalis (sexually transmitted) Euglenids: distinctive mitochondria, flagella, mixed nutritional methods.
