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20 Cards in this Set
- Front
- Back
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protists are usually,
but can form |
unicellular, colonies
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protists are _ because _
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eukaryotes, because their cell has a nucleus surrounded by a nuclear membrane
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protists are both
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autotrophic or heterotrophic
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protozoa
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protists that act like animals. they are all heterotrophic and most are one-celled. (some are free-living and are found in lakes or oceans, others are parasitic)
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protozoa are classified by how the organisms
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move
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phylum sarcodina
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move by forming projections with their membrane and cytoplasm.
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pylum cilophora
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move by the use of cilia
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phylum zoomastigina
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move by using flagella
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phylum sporozoa
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have no means of locomotion, are parasites and move along in the blood circulating in their hosts.
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amoeba
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-sarcodine
-lacks shell -freshwater -no definite outline -jellylike cytoplasm (changes shape) -move by pseudopodia -cell membrane allows to take in 02 for resp. and expel CO2 -binary fission - asexual reproduction -responds to chemicals and light, form cysts if environ. becomes too harsh |
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amoebas receive most of their nutrients through
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diffusion
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phagocytosis
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cell eating
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pinocytosis
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cell drinking
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the largest group of protists are
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cyliaphores (fresh and salt)
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paramecium
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-definite, changing shape
-"slipper organism" -covered by pellicle (retains its shape) -two nuceli: macro and micronucleus -posterior where waste products -trichocysts: defense system small, poisenous darts -paramecium aurelia -50-300 micrometers -colorless |
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mode of nutrition for paramecium
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osmoregulation: pair of contractile vacuoles, expel water absorbed by osmosis
(live in fresh and pond scum) |
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mode of reproduction for paramecium
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asexual, but when food low, reproduce through conjugation.
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evidence of stimulus responce in paramecium -
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attracted by acidic condition (attracted to environ. with hydrogen ions) - acidic conditions...
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macronucleus
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controls most cellular processes
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micronucleus
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controls reproduction
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