Protists Flashcards
protista
kingdom of mostly unicellular eukaryotes
three types of protists
unicellular, colonial, multicellular
methods of reproduction for protists
sexually, asexually, syngamy
syngamy
meiosis and fertilization
nutritional diversity of protists
photoautotrophs, heterotrophs, mixotrophs
mixotrophs
combine photosynthesis and heterotrophic nutrition
algae
unicerllular or filamentous photoautotrophs; mostly aquatic
thallus of algae
body of multicellyular algae
multicellular algaes
brown, red, greeen, yellow
thallus of algae consists of
holdfast, stipe, blade
all algae reproduce
asexually
multicellular algae can reproduce
sexually via alteration of generations and can fragment
Chlamydomonas
unicellular green algae, bi flagellate, has eyespot
brown algae
cellulose and alginic acid cell walls, multicellular and macroscopic
algin
substance produced by brown algae; used as food thickener
pneumocyst
pocket filled with gas to help brown algae float
red algae
have branched thalli, most are multicellular
red algae harvested for
agar and carrageenan, some produce a lethal toxin
green algae
cellulose cell wall, uni or multicellular, chlorophyll a and b - thought to be evolutionary link to land plants
diatoms
pectin and silica cell walls, unicellular or filamentous, store oil
diatoms produce
domoic acid which can cause neurological disease
dinflagellates
cellulose plasma membrane, unicelluylar
dinoflagellates produce
neurotoxins (saxotoxins) that cause paralytic shellfish poisoning
oomycota
water molds, cellulose cell wall, chemoheterotrophic, zoospore, decomposers
phytophthora infestans
caused irish potato famine
phytophthora cinnamoni
infects eucalyptus
phytophthora ramorum
causes sudden oak death
roles of algae in nature
fix CO2, produce 80% of earth’s oxygen
oil production, symbionts, algal blooms
zoonosis
something that will come from animals (zoonotic infection can transfer animal to animal
protozoa
unicellular eukaryotes found in water and soil
trophozoite
feeding and growing form of protozoa
reproduction of protozoa
asexual: fission budding or schizogamy
sexual: conjugation
schizogamy
multiple fission
paramecium
has macro and micro nuclei, slipper shape
pellicle
outer protective coat requiring special structures to take in foodl
excavata 3 types
diplomonads, parabasalids, and euglenozoa
diplomonads
no mitochondria, multiple flagella (giardia)
parabasalids
undulating membrane, no cyst shape
euglenozoa
photoautotrophs or facultative chemotrophs
hemoflagellates
transmitted by blood feeding insect bites
amebae
move by pseudopod
entamebae hystolytica
causes amebic dystentary
acanthamoeba
infects cornesas and causes blindness
balamuthia
granulomatous amebic encephalitis
apicomplexa
nonmotile, obligate intracellular parasites
toxoplasma gondii
transmitted by cats, causes fetal infections
cryptosporidium
transmitted via feces, cauyses waterborne illness
plasmodium
causes malaria, sexually reproduces in Anopheles mosquito - injects sporozoite in bite - undergoes schizogony in liver, merozoites are produced
merozoites infect
red blood cells, form ring stage inside, RBCs reupture
ciliates
moce by cilia arranged in precise rows
Balantidium coli
onlly human parasite - dysentary
cellular slime molds
represent ameba, phagocytisize fungi and bacteria; cells aggregate to form stalks and spore caps that differentiate into spores
plasmodial slime molds
mass or protoplasm with multinuclei; move as giant ameba; has cuytoplasmic streaming
cytoplasmic streaming
protoplasm moves and changes speed/direction to distribute oxygen and nutrients