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Pretty Protist Project
Transcript of Pretty Protist Project
What are Protists?
Variety in Organisms
Range of size from extremely small eukaryotes to extremely large
Range in behavior from small intricate organisms, to plant-like organisms
Range in Habitat- Aquatic & terrestrial
Why Should I Care?
The Very First Eukaryotes
Very Diverse collection of organisms!
protists have important roles pertaining to human activity
Importance in Ecosystems
In oceans, protists act (in conjunction with prokaryotes) as the primary producers
Act as primary, secondary and other early stage consumers
Microscopic protists provide an important step in the food chain
Unfortunately their roles aren't known well
However, still present in many environments- especially humid or wet ones
Parasitic & disease causing
Rely on living inside or on another life source- Host organism (Most Protists act as parasites)
Affect humans, animals, and plants
causes Malaria, a serious condition, especially in developing countries, causing over
Sleeping sickness, amoebic dysentery
, a common issue,
which is present in the north and in aquatic ecosystems with beavers is caused by protists. Drinking
can allow the parasite to infect you,
Also known as
, it's an intestinal parasite that causes pain, inflammation and diarrhea.
: Nori- species of a multicellular protist (
organelles with membranes
Where did these membranes come from?
Thought they originated from the folded and bent cell membrane
By manipulating the membrane surface area is increased
Eventually over the time, the folds and pockets developed into separate internal membranes.
: mitochondria and chloroplasts
Both modern organelles have
Inner membrane: resembles
Outer membrane: resembles membrane of the host
Both contain their own
chloroplasts and DNA,
meaning their control their own processes
Binary fission allows them to
on their own
The ubiquitous theory is that originally
independent prokaryotic cells
, both mitochondria and chloroplasts worked their way into eukaryotic cells, and eventually became
of them (no longer capable of being organisms themselves).
a relationship in which a single-celled organism lives within the cell(s) of another organism.- Biology 11 (61)
Engulfed by Eukaryotic cell
Gain food supply, Eukaryotic cell gains waste energy produced by prokaryotes
Engulfed by Eukaryotic cell
Gain Carbon dioxide waste from the eukaryotic cell, while eukaryotic cell gains extra food from prokaryotic cell
-Haploid sex cells form diploid zygote
Alternation of Generations
life cycle with both
Brown Algae (Producer)
male gametocyte in
red blood cell
Thanks for listening!
Phylogeny & Classification
Most diverse eukaryotes
More than 200 000 species
Not based on evolutionary
The "Catch-All" Kingdom
Has been used just as matter of convenience
For species that did not fall into any other major
No "model" protist
- Not animals, plants or fungi
- Moist environments
- Flagella/cilia as extension of
Different ways of moving, getting nutrients, energy and
Interactions in Ecosystems
Producers & Consumers
Primary producers in aquatic
food webs. Ex- seaweed
Increased acidity and temperatures interfere
with protists' ability to produce outer
Without this layer, the protist is most likely
to die, which damages the food web.
Raised temperatures may increase the
population of some species, which may also
have an effect on the food web
Ex - Phytoplankton: Produce half the Earth's oxygen
Organisms that rely or depend on one another.
Symbiotic photosynthetic protists,
that live in corals and source food.
Increased temperatures, lose the
green chlorophyll pigment and are
unable to perform photosynthesis.
Coral becomes white and dies.