BIOL 121 Lecture Notes - Lecture 1: Halococcus, Nostoc, Oscillatoria
Document Summary
All cells contain cell membrane, cytoplasm, ribosomes (protein synthesis), and genetic info. Dna is found in nucleoid region in one circular chromosome. Cell walls contain peptidoglycan chain of sugars and amino acids. Gram staining positive if they have thick peptidoglycan (purple) and negative if thin (pink; often pathenogenic) Sapotroph/heterotroph secretes enzymes and absorbs the products of extracellular digestion. Adaptation: capsule protects it from acidic environment. Can be unicellular, colonial, filamentous and even branched. Gelatinous sheath allows to adhere to each other + protection. Thylakoids folds increase surface area of membrane for photosynthesis. Motile gas vesicles and flagellum (to move closer to the sun) Adaptations halorhodopsin (unique protein to pump na+ into cell to prevent. Photoheterotroph sunlight for energy and environment for nutrients dehydration) and bacteriohodopsin (reddish pigment to convert sunlight to. Protists may not be closely related and are currently being reclassified. Can live in freshwater, animals, saltwater and moist soil. Entamoeba gingivitis and entamoeba histolytic (amoebic dissentry)
