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20 Cards in this Set

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Protists-3 characteristics?
unicelluar, colonia, or simple multi-cellular organisms
coenocytic
multinucleate mass of cytoplasm
3 types of protists?
Algae
water molds
protozoa
symbiosis
intimate association between organisms of different species
3 symbiotic associations
mutualism
commensalism
parasitism
mutualism
both partners benefit from each other
commensalism
1 partner is benefits and the other has no effect
parasitism
1 partner benefits (parasite) and the host is harmed.
evolution of protists
protists were the 1st eukaryotic cells to eveolce from prokaryotes
endosymbiont theory
organelles (mitochondria & chloroplasts) have evolved from mutually symbiotic relationship b/t 2 prokaryotic organisms
mutualism
both partners benefit from each other
commensalism
1 partner is benefits and the other has no effect
parasitism
1 partner benefits (parasite) and the host is harmed.
evolution of protists
protists were the 1st eukaryotic cells to eveolce from prokaryotes
endosymbiont theory
organelles (mitochondria & chloroplasts) have evolved from mutually symbiotic relationship b/t 2 prokaryotic organisms
evolution of mitochondria & chloraplasts
chloraplasts evolved from cyanobacteria.
mitochondria from aerobic bacteria
evolution of ER and nuclear envelope
formed from plasma membrane invaginations
ALGAE
have pigments
cellwalls: cellulose
energy reserve: starch
evolved into: land plants
asexual reproduction in algae
zoospores are formed which are haploid.
Sexual reproduction in algae
their gametes are identical (isogametes). A zygote is formed and releases 4 zoospores.

thruout most of life cycle algae is haploid.