Chapter 28 - BSC 1010 Dr. Presley Chapter 28 KINGDOM...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Dr. Presley Chapter 28 KINGDOM PROTISTA EVOLUTION OF EUKARYOTIC CELL See Figure 28.3 on page 545 - origin of a flexible cell surface allows folding, increases surface to volume ratio, vesicle formation by phagocyte - origin of a cytoskeleton - origin of a nuclear envelope by membrane invagination with DNA attached - appearance of digestive vesicles - endosymbiotic acquisition of mitochondria from proteobacteria and chloroplasts from cyanobacteria evidence: - size of organelles and their ribosomes - membrane enzymes and transport proteins - replication is binary fission-like - circular DNA without proteins - RNA sequences more like prokaryotes than eukaryotes Secondary endosymbiosis in algae may account for plastids with 3+ membranes GENERAL CHARACTERISTICS eukaryotic: mostly unicellular, but can also be colonial, or simple multicellular in DOMAIN Eukarya habitat: most are aquatic; freshwater, marine (plankton), moist soils, body fluids most metabolically diverse of eukaryotes: - few lack mitochondria, some anaerobic - heterotrophs which ingest food – protozoa - heterotrophs which absorb predigested nutrients – fungi-like - photosynthetic autotrophs – algae - mixotrophs which have multiple metabolic strategies -- Euglena locomotion: - microtubular flagella, if present, produce whip action - microtubular cilia, if present, move in oar-like beating action - pseudopods - constantly changing body mass vesicles for variety of functions: - increases effective surface to volume ratio food vacuoles allow digestion and absorption of usable nutrients (Fig.28.6, p.547), contractile vacuoles for osmoregulation (Fig.28.5, p.547) cell surface: - outer plasma membrane - Amoeba , - cell wall -- algae - internal shells of calcium carbonate – foraminiferans - pellicle - Paramecium reproduction: asexual reproduction by binary fission, multiple fission, budding, spores sexual reproduction (syngamy) possible in some, various methods CLASSIFICATION – organized as “traditional” taxa and informal groups, these are used in the BSC 1010 laboratory ***Suggestion: Memorize the taxonomy with its representative organisms. Then learn the details about the structure and function of the representatives. PROTOZOA – animal-like, ingestive, grouped by movement Phylum Rhizopods -- amoeba (sarcodines) Phylum Actinopoda – radiolarians Phylum Foraminifera – forams Phylum Ciliophora -- ciliates such as Paramecium Phylum Zoomastigophora -- zooflagellates such as Trypanosoma Phylum Apicomplexa -- sporozoan such as Plasmodium ALGAE – plant-like, mainly photosynthetic, grouped by pigments Phylum Chlorophyta -- green algae Phylum Phaeophyta -- brown algae Phylum Chrysophyta -- golden brown algae Phylum Bacillariophyta – diatoms Phylum Dinoflagellata -- dinoflagellates Phylum Euglenophyta -- euglenoids Phylum Rhodophyta -- red algae SLIME MOLDS – fungus-like, absorptive Phylum Myxomycota - plasmodial slime molds, Physarum Phylum Acrasiomycota - cellular slime molds WATER MOLDS
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/31/2008 for the course BSC 1010 taught by Professor Presley during the Spring '06 term at Virginia Tech.

Page1 / 7

Chapter 28 - BSC 1010 Dr. Presley Chapter 28 KINGDOM...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online