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Flashcards in Protist Deck (17)
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1

Eukarya

1 of 3 taxonomic domains of life

- unicellular orgs (most protist/yeasts)
- multicellular orgs (fungi, plants, animals)
- membrane-bound cell nucleus, numerous organelles & extensive cytoskeleton
- large cells
- undergo meiosis
- most reproduce sexually

2

protist

any eukaryote that is not green plant, animal or fungus
- diverse paraphyletic group
- most = unicellular
- some = multicellular or form aggregations
- tend to live in water surrounded environments

3

malaria

human disease caused by 5 species of protist "Plasmidium"
- passed to humans by mosquitoes

4

primary producers

org that creates own food by photosynthesis or related inorganic compounds
- food source for other species
- aka autotroph

5

plankton

drifting orgs in aquatic environment

(ie) animals, plants, archaea, bacteria

6

food chain

pathway of energy flow
- subset of food web
- primary producer -> secondary producer -> decomposer
- describes nutritional relationships btwn orgs

7

global carbon cycle

worldwide movement of carbon among terrestrial ecosystems, oceans & atm

8

flagellum

long, cellular projection that undulates (eukaryotes) or rotates (prokaryotes) to move through environment

pl. flagella

9

endosymbiosis theory

mitochondria originated when bacterial cell took up residence inside another cell
- aka primary endosymbiosis (3 membranes)

"inside-living-together"

10

symbiosis

any close & prolonged physical relationship btwn individuals of 2 diff. species

11

endosymbiosis

association btwn orgs of 2 diff. species in which one lives inside cells of other

12

phagocytosis

uptake by a cell of small particles or cells by invagination & pinching off plasma membran to form small, membrane-bound vesicles
- one type of endocytosis

13

pseudopodia

temporary bulge-like extension of certain protist cells
- used in cell-crawling & ingestion of food

pl. pseudopodium

14

decomposer

org whose diet consists mainly of dead organic matter (detritus)
- aka detritivore

(ie) various bacteria, fungi, protists & animals

15

detritus

dead organic matter layer
- acquires @ ground level or seafloors/lake bottoms

16

parasite

org that lives on a host species (ectoparasite) or in a host species (endoparasite) & damages host

17

amoeboid motion

cellular movement involving actin filaments
- pseudopodia stick to substrate & pull cell forward

(aka) cell crawling