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Protists

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Robert Williford

on 9 March 2015

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Transcript of Protists

In this section we will discuss what the defining characteristics of protists are, and what the three categories are.
Protists
All protists are eukaryotic, meaning they have a nucleus and many organelles in their cells. Most protists are single celled organisms but some are multicellular. They can be producers, consumers or decomposers.
Fungus Like Protists
General Characteristics
The protists that obtain their food from dead organic material and break it down into a simple usable form are called
funguslike protists
.

Slime molds are shapeless blobs that can be unicellular or come together to form a group of cells with many nuclei but share a single cytoplasm.
Plantlike Protists: Algae
Algae
are protists that contain chlorophyll, so they can photosynthesize. They also are the only true multicellular protists but not all of them are multicellular.

Multicellular algae is called seaweed or kelp. Single celled algae are called
phytoplankton.
Algae: continued
Diatoms are single celled and can be found in fresh or saltwater. They make up a large percentage of phytoplankton.
Animal-like Protists: Protozoa
Protozoa
are animal-like protists that are single celled consumers. Some are parasites and many can move but they are usually divided into four groups: amoebalike protists, flagellates, ciliates, and spore-forming protists.
Protozoa: continued
Ciliates are the most complex protozoa. They have hundreds of hairlike cilia that allow them to move. The most common known ciliate is the paramecium.
Reproduction of Protists
Some protists reproduce asexually, such as amoebas and euglena. Some protists reproduce sexually like paramecium. Many protists can do both, like algae, and will alternate their method of reproduction from generation to generation.
Water molds are funguslike protists that live in water, moist soil, or inside other organisms. It can be a decomposer or a
parasite
.
A
parasite
invades a
host
organism to get it's nutrients.
red algae
brown algae
green algae
Dinoflagellates re single celled algae that mostly live in saltwater. They have flagella that allow them to move and they can be producers, consumers, decomposers or even parasites.
Euglenoids are single celled protists that mostly live in freshwater and can respond to stimuli like animals but photosynthesize like plants.
amoebalike protists are soft jelly like single cellular protozoa that feed by engulfing prey.
Flagellates are protozoa that use flagellum to move. They can be parasites such as Giardia that cause severe diarrhea and stomach cramps.
Spore-forming protists are parasites that absorb their nutrients from a host. They can cause diseases like malaria.
Sexual Reproduction Cycle
Gametes
- a cell that contains a single copy of the DNA. Two join together in sexual reproduction to make a unique combination of genes.
haploid
- word used to describe a cell with only one copy of DNA.
diploid
- word used to describe a cell with two copies of genes.
gametophyte
- haploid generation of adults.
sporophytes
- diploid generation of adults.
Spores
- haploid reproductive cells that are resistant to the environment.
Full transcript