Ch 28 Protists (NOT DONE) Flashcards Preview

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Flashcards in Ch 28 Protists (NOT DONE) Deck (32):
1

Characteristics of protists

1) Eukaryotes
2) Unicellular

2

Is "protist" a good monophyletic group?

No

It is polyphyletic

3

Protist

Anything that is not a fungus, plant, or animal

4

How many phyla are included as protists?

30 to 40

5

Xenophyophores

Deep sea protists

6

What are the larger free-living single cells?

Xenophyophores

7

How large are xenophyophores?

Over 10 cm long

8

Endosymbiosis

The process in which a unicellular organism engulfs another cell, which becomes an endosymbiont and then organelle in the host cells

9

Mitochondria evolved via what?

Endosymbiosis of an aerobic prokaryote

10

Plastids evolved via what?

Endosymbiosis of a photosynthetic prokaryote

11

What is now thought to have occurred repeatedly in the evolution of eukaryotes?

Endosymbiosis

12

Supergroup Excavata

Share a similar cytoskeleton and some have an "excavated" feeding groove on the side of the body

13

Supergroup Excavata includes:

1) Diplomands
2) Parabasalids
3) Euglenozoans

14

Diplomands have (1)___ that do not function in (2)___ ___

1) Mitochondria
2) Aerobic metabolism

15

Diplomands have two equal-sized (1)___ and mulitple (2)___

1) Nuclei
2) Flagella

16

Giardia lamblia

A parastie of the human digestive tract

A diplomand

17

How is Giardia lamblia acquired?

By drinking from infected streams, etc.

18

Parabasalids have (1)___ that generate some energy (2)___

1) Hydrogenosomes
2) Anaerobically

19

Hydrogenosomes

Reduced mitochondria

20

Trichomonas vaginalis

Commonly infects the human urinary and reproductive tracts

A parabasalid

21

Euglenozoans includes what three things?

1) Predatory heterotrophs
2) Photosynthetic autotrophs
3) Parasites

22

Main defining characteristic of Eugleonzoans

A spiral or crystallin tod inside the flagella

23

Two groups included in Euglenozoans:

1) Kinetoplastids
2) Euglenids

24

Trypanosoma brucie

Infects humans and cattle

A kinetoplastid (Euglenozoan)

25

What does Trypanosoma brucie cause?

African sleeping sickness caused by invasion of the central nervous system

26

How is Trypanosoma brucie transmitted from host to host?

By tsetse flies

27

The genome of Trypanosoma brucie codes for what?

Variable surface glycoproteins (VSG's)

28

Variable surface glycoproteins (VSG's)

Are expressed sequentially to help the parasite evade the host's immune system

29

Leishmania

Can cause cutaneous (skin) or internal infections

A kinetoplastid (Euglenozoan)

30

Leishmania is carried by what?

Sandflies

31

Leishmania occurs where?

All continents except Australia and Antarctica

32

Euglena

A Euglenozoan

A mixotroph