25 coccidia Flashcards
eimeria
Unicellular eukaryotic parasites, they
move by gliding and invade host cells where they replicate
apicomplexa
coccidia make — which are meiotic spores
oocyst
most apicomplexa have — organelles
plastids- little chloroplasts that provide food and color to cells
ampicomplexa have — genome
haplonts (1N)
will go through meiosis immediately after fertilization
how do apicomplexa move
gliding- conveyor belt
actin/myosin and trail of parasite protein
(sorta like a snail)
— system moves proteins that are secreted onto the surface at the
apical end in to the basal
end of the parasite like a conveyor belt
actin/myosin
— deliver adhesion complexes to the parasite surface and
are needed for gliding
and invasion
Micronemes
— are secreted
only during invasion
Rhoptries
Dense Granules are
secreted after —
invasion
Actin filaments are moved by myosin motors anchored in the parasite cell to the — and its microtubule skeleton by the GAP complex
pellicle
how does apicomplexan get into host cell
moving junctions
rhoptries inject protein into host cell that acts as anchor gliding machine (micronemes) to pull cell into the cell
leave behind small piece as door
Parasite —- ‘inject’
proteins into the host cell
(RON) to serve as receptors for proteins secreted by —- that link to the gliding machine (AMA)
rhoptries
micronemes
DNA replication, nucleur division, and daughter formation occur together and two cells emerge
Endodyogeny
Multiple rounds of DNA replication and nuclear division lead to multinucleated schizont. Each nucleus is ‘packed’ into a daughter in final division and many cells emerge at once
Schizogony
DNA replicates
multiple times yielding a large polyploid nucleus. In final division nucleus split into many small nuclei that are ‘packed’ into daughters. Many
cells emerge at once
Endopolygeny
crypto oocyst looks like
sporozoites/oocyst
eimeria oocyst look like
4 sporocysts/oocysts
2 sporozoites/sporocyst
8 sporozoites/oocyst