The factor that MOST affects the thermostability of a protein is its :

The factor that MOST affects the thermostability of a protein is its
 
  A) highly hydrophobic core regions.
  B) folding pattern.
  C) ionic surface interactions.
  D) number of hydrogen bonds.

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Many hyperthermophiles of Archaea are ________; however, Staphylothermus is a chemoorganotroph.
 
  A) chemolithotrophs
  B) mixotrophs
  C) parasites
  D) photoheterotrophs

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________ 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.
 
  A) Pyrodictium
  B) Pyrolobus
  C) Pyrobaculum
  D) Desulfurococcus

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Which archaeal phylum contains primarily extreme halophiles and methanogens?
 
  A) Crenarchaeota
  B) Euryarchaeota
  C) Nanoarchaeota
  D) Thaumarchaeota

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Which of the following is TRUE about the crenarchael genera Sulfolobus?
 
  A) Sulfolobus grows in sulfur-rich hot alkaline springs.
  B) Sulfolobus is an anaerobic chemolithotroph.
  C) Sulfolobus can grow chemoorganotrophically.
  D) Sulfolobus is a gram-positive rod.