topic 10- PROTISTA

bio 103 final exam

protists are…

• eukaryotic

• unicellular and multicellular species

• nonmotile and motile species

• aquatic and terrestrial species

• autotrophic (photosynthetic) and heterotrophic species

protist examples

• paramecium

• amoeba

• slime mold

• euglena

A protist is a _______ that is…

Eukaryote

• not a plant

• not a fungus

• not an animal

protists have no unique _________ that distinguish them from other eukaryotes!

synapomorphies

protists are not a _______ group, as they contain a common ancestor and some, but not all descendants. Instead they form ________ groups!

monophyletic; paraphyletic

why are protists important in the aquatic food pyramid?

they are the base, so ecosystems would collapse without them

plasmopara viticola

• causes downy mildew of grapes

• destroyed the wine and grape industries

• a professor created the first foliar fungicide used to control plant diesase and solved the problem

phytophthora…

• causes diseases in avocados, onions, tomatoes, strawberries, apples

• most famous member is P.infestans

  • cause late blight of potato (disease)

phytophythora results in the _____________

destruction of the tubers

phytophythora caused the ________ in Ireland

potato famine

single celled protists use ________ as a means of _______ reproduction

mitosis; asexual

single cell protists may have been the first to have…?

sexual reproduction

most protists have a …?

haploid dominant life cycle

some protists have a

diploid dominant life cycle

other protists exhibit an alternation of ______ and ______ multicellular generations

haploid; diploid

zygotic meiosis is….

haploid dominant

anisogamy

the gametes are NOT identical

oogamy

“fraternal”, one is sperm and one is egg

isogamy

identical gametes

rockweed fucus (brown algae)

• oogamy “fraternal”

• diploid dominant

• gametic zygosis

• everything is diploid except the haploid gametes

alternation of generations (AoG)

plants (sporic meiosis) and algae

heteromorhphic (AoG)

brown algae (haploid spores)

isomorphic (AoG)

sea lettuce