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Flashcards in Chapter 28 Deck (9)
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1
Q

What is a protist?

A

Any eukaryote that is not a plant, animal, or fungus. Mostly unicellular, though some are colonial or multicellular.

2
Q

How did complex organelles like the mitochondrion and chloroplast evolve (also look at 25.3)?

A

Endosymbiosis: they were engulfed by a cell and became organelles

3
Q

What is the evidence for the endosymbiosis theory?

A

DNA analysis

4
Q

What is secondary endosymbiosis?

A

A process in eukaryotic evolution in which a heterotrophic eukaryotic cell engulfed a photosynthetic eukaryotic cell, which survived in a symbiotic relationship inside the heterotrophic cell.

5
Q

Give some examples of symbiotic protists.

A

Protists in termite guts that help break down food. Protists in P. Bursaria that provide the cell with nutrients.

6
Q

Give some examples of disease causing protists.

A

Malaria protozoans (plasmodium)

7
Q

What is the role of protists in aquatic communities?

A

They play an important role in the ecosystem because they are food for many marine animals

8
Q

What is a producer?

A

An organism that produces organic compounds from CO2 by harnessing light energy or by oxidizing inorganic chemicals.

9
Q

There used to be a kingdom Protista; why does it no longer exist?

A

They share a common ancestor with plants, animals, and fungi