Archaeal chains are branched. Bacterial chains are what?
- Ring sugars
- Straight fatty acids
- Short proteins
Which links do archaeal membrane lipids use?
- Ester links
- Glycerol free links
- Ether links
Ribosomal RNA places archaea closer to eukaryotes than to bacteria.
Circle one: True False
Which grouping rests on genetic relatedness, not habitat?
- Two empires of microbes
- Three domains of life
- Five kingdoms of cells
Why do archaeal membranes survive boiling springs?
- They are twice as thick as ours
- They contain no lipids at all
- Ether bonds resist breaking and branched chains pack tight
A new microbe thrives in acid. Can you call it an archaeon?
- Yes, acid means archaeon
- Only if it is large
- No, bacteria live in acid too
Which pair are both archaea?
- Methanogens and halophiles
- Soil bacteria and skin bacteria
- Two kinds of cyanobacteria
Which archaeal machinery is closer to ours than to bacteria?
- Photosynthesis
- Transcription and translation
- Nitrogen fixing
The third domain of life W1-mt_isKmuoGgAn-s1
- Straight fatty acids · Bacterial lipids use ester links to straight fatty acids.
- Ether links · Archaeal lipids use ether links to branched chains.
- True · That gene branch is what earned archaea their own domain.
- Three domains of life · Bacteria, Archaea, and Eukarya are grouped by genes.
- Ether bonds resist breaking and branched chains pack tight · Each chemical difference adds stability under heat, salt, and acid.
- No, bacteria live in acid too · Many extremophiles are bacteria, so habitat alone never decides.
- Methanogens and halophiles · Methanogens and halophiles are both archaeal groups.
- Transcription and translation · Their transcription and translation machinery matches eukaryotes best.