Chapter 25: The Origin/Diversification of Eukaryotes Flashcards

1
Q

What are Eukaryotic cells?

A

cells that contain membrane-enclosed nucleus/organelles

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2
Q

What are the four subgroups of Eukaryotes?

A

Excovata, SAR, Archaeplastida, Unikonta

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3
Q

What characteristics do Eukaryotic cells have?

A

-A membrane-enclosed nucleus
-Membrane-bound organelles
-Cytoskeleton
-Linear DNA

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4
Q

What is a Pairwise Comparison Matrix?

A

compares genetic sequences for rRNA% similarity in sequences

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5
Q

What kind of organisms are Eukaryotes?

A

“Combination” with some genes/characteristics derived from Archaea and Bacteria

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6
Q

Which bacteria is most similar in rRNA to mitochondria?

A

A. tumefaciens

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7
Q

What is endosymbiosis?

A

a symbiotic relationship in which one organism lives inside the body/cell of another.

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8
Q

How did the rise of Eukaryotes begin?

A

An Archaeal cell engulfed a Bacterial cell that would later become an organelle found in all eukaryotes (the mitochondrion)

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9
Q

What is the Endosymbiont Theory?

A

Mitochondria and plastids were formerly small bacteria that began living within larger cells

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10
Q

How did Bacterial symbionts originate in Archaeal host cells?

A

Through undigested prey and internal parasites

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11
Q

What is the evidence of endosymbiotic origin of mitochondria/plastids?

A
  1. Inner membranes have transport systems like those of plasma membranes in living bacteria.
  2. Mitochondria/plastids undergo binary fission.
  3. DNA is circular.
  4. Have their own cellular machinery to transcribe/translate DNA to protein.
  5. Ribosomes are more like those of bacteria than those of ribosomes in the cytoplasm of Eukaryote cells.
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12
Q

What conditions would result in selection for an aerobic endosymbioant?

A

An anaerobe living in an env’t with increasing 02

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13
Q

What Eukaryotes have plastids?

A

Algae, photosynthetic protists, and all photosynthetic eukaryotes EXCEPT plants

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14
Q

Did Plastid Evolution by secondary endosymbiosis create a lot of diversity?

A

Yes

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15
Q

What are the oceanic primary producers?

A

Algae + cyanobacteria

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16
Q

Is NPP high or low in oceans?

A

Low

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17
Q

What did the 1st wave of eukaryotic diversification bring?

A

Greater complexity of unicellular forms

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18
Q

What did the 2nd wave of eukaryotic diversification bring?

A

The evolution of multicellularity

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19
Q

What are the two steps to multicellularity?

A

The formation of colonies and differential cells

20
Q

Why are special mechanisms required for animals?

A

enables the cells to adhere and communicate with each other

21
Q

What are choanoflagellates?

A

-the closest living protist to humans
-all unicellular or colonies
-have homologous mechanisms for adherence and signaling

22
Q

What defines the supergroup of Excavata?

A

Species that have excavated feeding groove

23
Q

What are the subgroups of Excavata?

A

Diplomonads/Parabasalids + Evglenozoans

24
Q

What defines a Diplomonad/Parabasalid?

A

-having a reduced mitochondria
-are anaerobic
-Many being parasitic

25
What defines a Evglenozoan?
-A diverse clade -are heterotrophs, photosynthetic autotrophs, parasites -Have a presence of a rod with crystalline structure inside of the flagella
26
What defines the supergroup of SAR Stramenopiles?
-secondary endosymbiosis -important photosynthetic organisms
27
What are the subgroups of SAR Stramenopiles?
Diatoms + Brown Algae
28
What defines the supergroup of SAR Alveolates?
-membrane-enclosed sacs (alveoli) -secondary endosymbiosis -photosynthetic/heterotrophic
29
What defines a Diatom?
-unicellular algae -highly diverse -unique wall structure of silicone dioxide
30
What defines Brown Algae?
-largest and most complex algae -multicellular -marine -lack true tissues/organs
31
What defines a Dinoflagellate?
-spin as they move -mixotrophs -some produce toxins
32
What are the subgroups of SAR Alveolates?
Dinoflagellate + Ciliates
33
What defines a Ciliate?
-cilia to move/feed -predatory
34
What defines the supergroup SAR Rhizarians?
-amoebas and flagellated non-amoeboids -pseudopodia
35
What are the subgroups of SAR Rhizarians?
Forams + Cercozoans
36
What defines a Foram?
-tests with little holes -symbiotic algae in tests -single-celled
37
What defines a Cercozoan?
marine, freshwater, soil -parasitic, predators, mixotrophs
38
What defines the supergroup of Archaeplastids?
-Red algae -green algae -plants
39
What defines red algae?
-Reddish pigment masks chlorophyll -survive in deeper depths -multicellular -photosynthetic and heterotrophs
40
What defines green algae?-
-similar chloroplasts to plants -Charophytes -Chlorophytes
41
What defines the supergroup of Unikonta Amoebozoans?
-unicellular -multicellular (slime molds)
42
What makes up Unikonta Amoebozoans?
Tubulinids + slime molds
43
What defines a Tubulinid?
-unicellular -Heterotrophs (some feed on detritus) -soil, freshwater, marine
44
What defines a slime mold?
-produce fruiting bodies -Feeding stage--> solitary cells -reproductive stage--> aggregate
45
What are the 4 Eukaryotic supergroups?
Excavata, SAR, Archaeplastids, and Unikonta