Prokaryotic diversity & phylogeny Flashcards

1
Q

endosymbiont theory

A

mitochondria and plastids (chloroplast and related organelles) were formerly small prokaryotes that began living within larger cells

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2
Q

serial endosymbiosis

A

mitochondria evolved before plastids
infolding of plasma membrane> cell with nucleus and endomembrane system (nucleus, nuclear envelope, & endoplasmic reticulum)

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3
Q

what is the importance of horizontal gene transfer in the evolution of prokaryotes & early eukaryotes?

A

over 100 MYA prokaryotes acquired genes from even distantly related species and they continue to do so today. This is why the phylogenic tree is a hypothesis because it is always changing/evolving.

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4
Q

Transformation

A

genotype and possibly phenotype of a prokaryotic cell are altered by the uptake of foreign DNA from its surroundings.

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5
Q

Transduction

A

phages carry prokaryotic gene from one host cell to another.

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6
Q

chemoheterotrophic decomposers

A

break down dead organisms as well as waste products and thereby unlocking supplies of C, N, and other elements. Live with cease without!

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7
Q

Cyanobacteria

A

uses CO2 to produce organic compounds; also produces atmospheric O2
autotrophs
1st single-celled organisms
created photosynthesis as well as oldest fossils: stromalites (green: chl a)

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8
Q

Nitrogen fixers

A

produce atmospheric N2 which produce building blocks of proteins & nucleic acids

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9
Q

Domain Archaea

A
lack peptidoglycan
divided into: halophiles, thermophiles, and menthanogens
possess methionine (same as EUK)
Histones associated with DNA (same as EUK)
Circular chromosomes (same as Bac)
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10
Q

gram stain

A

used to categorize bacteria based on cell wall compositon

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11
Q

gram positive

A

more peptidoglycan
purple
non-disease causing

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12
Q

gram negative

A

less peptidoglycan
red
toxic and resistant to antibiotics

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13
Q

Conjugation

A

DNA transferred between two cells that are temporarily joined

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14
Q

Antibiotics prevent growth of peptidoglycan?

A

true

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15
Q

What is mutualism?

A

+/+

ex: E. Coli

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16
Q

What is parasitism?

A

+/-

ex: Trypanosoma

17
Q

What is commensualism?

A

+/0

ex: Staphylococcus

18
Q

Bacteria

A

peptidoglycan cell walls
one kind of RNA polymerase
absent of histones
Groups: Proteobacteria, Chlymadias, Spirochetes, Cyanobacteria, & gram positive

19
Q

Enteric Bacteria

A

fr Proteobacteria

Ex: salmonella & E.Coli

20
Q

ex: Salmonella

A

endotoxins
gram negative
produce food poisoning

21
Q

ex: E.Coli

A

mutualistic symbiont

vitamin k produces blood clotting

22
Q

Nitrogen fixing bacteria

A

fr Protebacteria
mutualistic symbionts of lugumes
Nitrogen for carbohydrates

23
Q

Myxobacteria

A

soil dries or food is scarces, releases resistant “mycospores”

24
Q

Bdellovibrios

A

attacks other bacteria outer covering

25
Chlymadias
intercellular steals hosts ATP gram negative non peptidoglycan
26
Spirochetes
cork-like screw internalized flagella under cell wall heterotrophs
27
Gram positive
divided: actinomycetes, endospore forming bacteria, & mycoplasmas
28
Actinomycetes
``` free living decomposers ray-like form colonies of branched chains of cells non parasitic/mutualist greater majority inhabits soil antibiotics ```
29
Endospore forming bacteria
exotoxins obligate anaerobes deadly pathogens resistant cells developed by certain bacteria
30
Mycoplasmas
lack cell walls tiniest known cells free living soil bacteria
31
Exotoxins
proteins secreted by certain bacteria and other organisms.
32
Endotoxins
lipopolysaccharide components of the outer membrane of gram-negative bacteria. In contrast to exotoxins, endotoxins are released only when the bacteria die and their cell walls break down.