Protozoans Flashcards
Pellicle = ______ + _______
Cytoskeleton and cell membrane
Whatbare the three main characteristics of protozoans? (Ground plan)
Motile, eukaryotic and multicellular
Cytoskeleton composition
Microfilaments, microtubules, and vesicles
Function of alveoli
For cell support
-> endoskeleton
For triggering cell response as Ca2+ is stored
Test
Skeleton that forms a more or less complete covering whether internal or external
What causes the flagellum to pull rather than push in protozoans?
Lateral mastigonemes
All types of nutrition occur in protozoans. T or F?
T
Types of nutrition
Photosynthesis
Absorption
Predatory
Heterotroph
Trace phagocytosis (general)
Food > cytostome > vacuole > cytopharynx > vacuole > lysosome > diffusion of digested stuff on cytoplasm > indigestible material > vacuole > out
Cytostome
Mouth
Cytopharynx
Specialised microtubular tract for fod
Mechanisms used in osmoregulation
Active ion transport and contractile vacuole complex
What composes the contractile vacuole complex?
Contractile vacuole and spongiome
Trace the process of osmoregulation in CVC
fluid > spongiome > contractile vacuole > pore
Protozoans are dominantly sexually reproductive
False
Fission
Division of parent into two or more daughter cells
Binary fission
Division into 2 similar progeny
Budding
Fission when one progeny is smaller than the other
Multiple fission
Parent into more than 2 daughter cells
Schizogony
Multiple fission where divisions of nucleus precede cell division
Open spindle
Nuclear membrane breaks down
Closed spindle
Nuclear membrane does not disintegrade on cloning
Protozoans utilize closed spindle cloning
True
Encystment process
Secretion of thickened envelope to body
Inactivity
