Create an account
Traits that can differ among protists
Most are single celled, but some are multi cellular
Some live in colonies
Some produce their own food
Some eat organisms or decaying matter
Some can control their movements and others cannot
How do protists differ from other eukaryotic organisms?
less complex and do not have specialized tissues
Name two ways protists get food
Protists get food by producing it or by getting it from their environment
What do many protist heterotrophs eat?
Small living organisms such as bacteria, yeast, or other protists
In what three ways do protist heterotrophs get food?
1. eating small living organisms
2. breaking down dead organic matter
3. Invading another organisms
In asexual reproduction, what process do single-celled protists use to divide into two cells?
What process do single-celled protists use in asexual reproduction to make more than two offspring from one parent?
What is conjugation?
Conjugation is when two protists reproduce sexually. (They join together and exchange genetic material by using a small second nucleus. Then they divide to produce 4 protists that have new combinations of genetic material)
When will a protist that normally reproduces asexually reproduce sexually?
When environmental conditions are stressful, such as when there is little food and water. Some Protist reproduction also alternates with each generation.
What is an example of a protist with a complex reproductive cycle?
Plasmodium vivax (P. vivax). This protist causes Malaria
Summarize the five steps it takes for Plasmodium vivax to complete its reproductive cycle
1. Mosquito infected with P. vivax bites a human delivering spores that infect human liver cells and reproduce to form Sporozoans.
2. Sporozoans enter the bloodstream from the liver, invade red blood cells, multiply rapidly and then burst.
3. Mosquito bites a human and picks up Sporozoans.
4. Sporozoans grow in the mosquito's gut and release large numbers of spores.
5. Spores move into the mosquito's mouth.
What three groups can scientists use to organize protists based on shared traits?
2. Heterotrophs that can move
3. Heterotrophs that cannot move
Name four places where green algae live
1. In water or moist soil
2. In melting snow
3. On tree trunks
4. Inside other organisms
What are the whip-like strands on a dinoflagellate that cause the cells to spin through water called?
Why don't euglenoids fit easily into one protist group?
Because euglenoids can get food in several ways
What is the purpose of a food vacuole?
So the enzymes can move into the vacuole to digest the food which can then be passed into the amoeba
What does the term mutualism mean?
One organism living closely with another organism to help each other live
What are the two uses for cilia?
1. To move a protist forward by beating the tiny hair-like structures back and forth.
2. For feeding. The cilia sweep the food towards the protists' food passageway.
Name two characteristics of spore-forming protists
1. Absorb nutrients from their host.
2. Have no cilia or flagella so cannot move on their own.
Please allow access to your computer’s microphone to use Voice Recording.
Having trouble? Click here for help.
We can’t access your microphone!
Click the icon above to update your browser permissions and try again
Reload the page to try again!Reload
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Please upgrade Flash or install Chrome
to use Voice Recording.
For more help, see our troubleshooting page.
Your microphone is muted
For help fixing this issue, see this FAQ.
Star this term
You can study starred terms together