18 Questions
Why do trypanosomes frequently change their surface protein?
To avoid detection by the human immune system
What is the ecological significance of dinoflagellates?
They are important phytoplankton species and many are mixotrophic
What is the name of the unicellular parasites that cause sleeping sickness in humans?
Trypanosomes
Which supergroup do brown algae belong to?
Archaeplastida
What is the term used to describe the process of trypanosomes changing their surface protein to avoid host immunity?
Antigenic variation
Which supergroup includes land plants?
Plantae
How does the plasmodium move?
By extending pseudopodia
What is the process of engulfing and digesting particles called?
Phagocytosis
In Dictyostelium discoideum, what happens to the cells that form the stalk of the fruiting body?
They die as they dry out
What can mutations in a single gene in Dictyostelium discoideum lead to?
Conversion of cells into 'cheaters'
How do 'cheating' cells in Dictyostelium discoideum differ from noncheating cells?
They lack a specific surface protein
What is the function of fruiting bodies in cellular slime molds like Dictyostelium discoideum?
To disperse spores for reproduction
What is the role of noncheaters in Dictyostelium aggregates?
They deprive cheaters of the chance to exploit them.
How might research on Dictyostelium aggregates contribute to the understanding of multicellularity?
By revealing how recognition systems can prevent cheating and promote cooperation among cells.
Are all protists single-celled organisms? Why or why not?
No, because some protists, like brown algae, are multicellular.
How does the classification of protists usually take place?
According to their cell structure, mode of nutrition, and reproduction.
What is the role of photosynthetic dinoflagellates in coral reefs?
They provide food for coral polyps through photosynthesis.
What significant insight into the evolution of multicellularity can be gained from studying cheaters in Dictyostelium aggregates?
Cheating behavior can threaten the stability of multicellular structures.
Test your knowledge on the characteristics and behaviors of Plasmodium and Cellular Slime Molds. Learn about their movement, feeding process, and formation of multicellular structures.
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