Chapter 19 Flashcards
1
Q
arcahea are the
A
most ecologically diverse of the three domains
2
Q
Extremophiles
A
Psychrophiles, hyperthermophiles, halophiles, acidophiles, methanogens
3
Q
Archaea abundant in moderate habitats
A
- Open ocean, soil, and surface of plant roots
* archaea lacks pathogens
4
Q
Archaeal cell membrane
A
- Use L-glycerol instead of D-glycerol
- Ether bonds
- Isoprenoid chains (Branched at every 4th carbon)
- Ends of side chains linked covalently to form tetraether
- Cyclopentane rings
5
Q
Most archaea possess a single membrane
A
without an outer membrane.
Many dont have cell wall, only S-layer
6
Q
pseudomurein or pseudopeptidoglycan
A
some archaea do have cell wall composed of this.
• Instead of N-acetylmuramic acid have N-acetyltalosaminuronic acid and beta(1,3) linkage
7
Q
• Similarities to bacteria
A
- Circular genome
- Gene size and density
- Has operons
8
Q
• Similarities to eukaryotes
A
- RNA polymerase has tata binding proteins, transcription factor B
- Has proteins similar to histones
9
Q
unique
A
- Some have reverse gyrases
* Guanosine analog archaeosine
