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Honors Principles of Biology II > Archaebacteria > Flashcards

Flashcards in Archaebacteria Deck (11):
1

Domain and Kingdom?

Domain: Archae
Kingdom: Archaebacteria

2

Features of some to all?

Cell wall of pseudopeptidoglycan. Plasma membrane has branched hydrophobic tails with ether linkage (phosphate group attached to top carbon) in lipid monolayer. Allows archaebacteria to withstand harsh conditions. No pathogens or parasites in this kindgom. Most archae live in soil, marshes, or oceans if they are not extremophiles. Methane producers of the world. Some photosynthetic archae, but no chlorophyll, retinol instead.

3

Halophiles

Condition of archae to love extreme salinity (high salt).

4

Acidophiles

Condition of archae to love acidic conditions.

5

Thermophile

Condition of archae to love high temperatures.

6

Euryarchaeotes

Only phyla of Archae not part of TACK supergroup. Methanogens included in this group. Many extreme halophiles, with some requiring very high salinities to live. Protein bacteriarhodopsin allows for ability to withstand high salinities.

7

TACK Supergroup contains:

Thaumarchaeotes
Aigarchaeotes
Crenarchaeotes
Korarchaeotes

8

Thaumarchaeotes

Newer phylum (as of 2008). Contains only four species. All are chemoautotrophs, all use ammonium (NH4+).

9

Aigarchaeotes

Only one species and one organism in this group. Found at the bottom of the Atlantic Ocean. Called: Nanoarchaeum equitans. Found as obligate symbiont of Ignicoccus.

10

Crenarchaetoes

Most within this group are extremophiles. Extreme thermophiles or acidophiles (or both). Some not metabolically active until 55 degrees Celsius (135 degrees Farenheit). Can grow in temperatures as high as 113 degrees Celsius (236 degrees Fahrenheit). Grow best in pH from 2-3. Example: Thermos aquaticus- thermally stable and responsbile for Polymerase Chain Reaction cultivation.

11

Korarchaeotes

"Kora" = young person. This is ironic considering this is one of the most primitive archae found. Only found in high temperature, hydrothermal environments.