bio ch 24
Terms
undefined, object
copy deck
- 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
- 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.