Protists (week 5) Flashcards
Protists - Phtoautotrophic
produce oxygen - primary prodcucers in both fresh and salterwater ecosystems
Archeaplastida - red Algae
multicellular, marine, mostly warm seawater
ecological importance: agar, dental impressions, cosmetics, food prep, electrophoresis
Archaeplastida - Green Algea
found in ocean, sea water, tree bark
Opisthokonta
type of protists have single flagellum at the back
Rhizaria
a diverse group of mostly heterotrophic unicellular eukaryotes including both amoeboid and flagellate forms
Many can make shells - varied shapes and materials
Chromalveolata - Dinoflagellates
bound by protective cellulose plates impregnated with silicates
has two flagella
some photosynthetic, heterotrophic, parasitic
Chromalveolata - Apicomplexans
Non motile parasites
most serious parasitic disease of humans is Malaria caused by Plasmodium
Malaria Life Cycle
- infected females bites human
- sporozoites (replicate asexually) travel to liver
- enter bloodstream and infect red blood cells, replicate until cell bursts
- some develop into the sexual forms, gametocytes
- mosquito bites infected human
- bury through mosquito gut wall, form oocyst
- inside oocyst, thousands of sporocytes develop and enter mosquitos saliva glands
Chromalveolata - Ciliates
- Ciliates among most complex protozoans
- hundreds of cilia beating coordinated rhythm
Chomalveolata - Diatoms + Golden Algae
- Diatoms most numerous unicellular algae in oceans and freshwater
Diatomaceous earth used as: filtring agents, sound-proofing, polishing abrasives
Chromalveolata - Brown Algae
- Live in colder oceans along rocky coasts
- Morphology: some small forms with simple filaments, other large multicellular forms may exceed 200m in length
- Pigments: chlorophyll a and c, type a of carotenoid pigments give them color
Excavata - Eugenozoans
- small freshwater unicellular organisms
- have one flagellum and an eyespot
Excavata - Euglenozoans
Kineplastids:
- colorless heterotrophs - unusual mitochondria
- most symbiotic and many parasitic
- well known for causing various diseases in humans
ex. African sleeping sickness, Chagas diseases
Life Cycle Fungi
- Haploid in life cycle
- Zygote is 2n stage
- Meiosis produces spores
- Individual always n
Life Cycle Green plants (algea)
- Alternation of generations
- Sporophyte is 2n generation
- meiosis produces spores
- Gametophyte is n generation
Life Cycle Animals and Green Algae
- Diploid life cycle
- individual is always 2n
- Meiosis produces gametes
