Term
| Characteristics of protozoans (4) |
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Definition
complete organism within one cell
lack a cell wall
at least one motile stage
most ingest their food but some are photosynthetic |
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Term
How do the following move?
flagellates
ciliates
amebas |
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Definition
flagellum
cilia
pseudopodia |
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Term
| Sliding microtubule hypothesis |
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Definition
chemical bond energy in ATP propels the action
The dynein protein arms release ATPase that cleaves the ATP
Release of ATP energy causes filaments to "walk along" an adjacent filament |
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Term
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Definition
| blunt extensions, contain endoplasm and ectoplasm |
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Term
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Definition
| thin extensions containing only ectoplasm |
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Term
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Definition
| long/thin pseudiopodia supported by axial rods or microtubules --> also useful for feeding and can extend and contract (can roll by sticking them out or pulling them in) |
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Term
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Definition
| membrane-bound organelles that function to extrude a wide range of structures from the cell |
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Term
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Definition
| synthesize their own food |
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Term
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Definition
| obtain organic molecules made by others |
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Term
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Definition
| ingest food particles (holozoic feeder) |
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Term
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Definition
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Term
| Explain digestion in phagotrophs |
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Definition
they use phagocytosis:
A cell membrane invaginates around a food particle, enclosing it as a "phagosome".
Lysosomes fuse with this phagosome and dump enzymes to digest the content.
The digested food is absorbed and the phagosome shrinks
Undigested material is released by exocytosis |
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Term
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Definition
| a mouth structure in ciliates and many fflagellates that is the cite of phagocytosis |
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Term
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Definition
| the cite of expulsion of wastes in ciliates |
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Term
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Definition
| transport of solutes directly across the cell membrane |
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Term
| How do protozoans typically reproduce |
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Definition
| binary fission, budding or multiple fission |
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Term
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Definition
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Term
| what type of gametes do most protozoans have? |
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Definition
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Term
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Definition
a dormant form
- they shut down metabolism and have a resistant covering
- can occur predictably or due to change in environment
- under favourable conditions the organism will escape from the cyst |
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Term
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Definition
| A blood parasite that causes African sleeping sickness and Chagas disease |
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Term
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Definition
| photoautotrophs that are responsible for red tide |
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Term
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Definition
| cause toxoplasmosis and malaria |
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