Archaea

Which type of cells are archaeans?

prokaryotic

Archaean cell walls are composed of what structural component?

polysaccharides

The phospholipids in archaean cells contain which type of linkage?

ether

What shape is the hydrocarbon chain in archaea?

branched

DNA of which domains is associated with histones?

1. archaea

2. eukarya

Which organelle's activity is not inhibited by antibiotics streptomycin and chloramphenicol in archaeans?

ribosome activity

Which group of archaea contains obligate anaerobes that

produce CH4?

methanogens

(Note: produced as

a by-product of

obtaining energy

from H2 to fix CO2)

Which group of archea lives in extreme environments?

extremophiles

Which extremophiles live in high salt concentration environments?

halophiles

(Note: salt lovers)

What metabolism do halophiles possess?

aerobic

To which category of energy utilization do most halophiles belong?

heterotrophic

(Note: others are anaerobic and photosynthetic with the pigment bacteriorhodopsin)

Which extremophiles are sulfur-based chemoautotrophs that live in very hot places?

thermophiles

(Note: heat lovers)