Exam 19: Archaea

Many hyperthermophiles of Archaea are chemolithotrophs, however Staphylothermus is a

Which archaeal phylum contains primarily extreme halophiles and methanogens?

Although Archaea contains many acidophilic organisms, there are still many others within the domain that grow well in environments with a neutral pH.

Hyperthermophilic Archaea have been found to contain dibiphytanyl tetraether lipids. Explain what the lipids form and what makes them different from lipids present in non- hyperthermophiles?

Crenarchaeotes whose optimal growth temperature is over 80°C are called _________.

Proteins known as _________function to refold partially denatured proteins.

_________is a strict anaerobe with an optimum growth temperature of 105°C that grows chemolithotrophically on H2 with S0 as an electron receptor or chemoorganotrophically on complex mixtures of organic compounds.

Describe two mechanisms that Archaea have to avoid their DNA melting at temperatures above 100°C.