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Archaea: Quiz


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Question 1: [91] Defenses against these viruses may involve ________ from repetitive DNA sequences within archaean genomes that are related to the genes of the viruses.
PiwiRNA interferenceModel organismGene expression

Question 2: These archaea include nitrifiers, methanogens and anaerobic ________ oxidisers.

Question 3: Other aspects of archaean biochemistry are unique, such as their reliance on ether lipids in their ________.
Vesicle (biology)Cell nucleusCell (biology)Cell membrane

Question 4: [44] In Thermoplasma and Ferroplasma the lack of a ________ means that the cells have irregular shapes, and can resemble amoebae.
Cell envelopeBacteriaChloroplastCell wall

Question 5: Archaea exist in a broad range of habitats, and are a major part of global ________,[7] and may contribute up to 20% of the total biomass on Earth.
Trophic levelEcosystemSystems ecologyEcosystem ecology

Question 6: This resistance to extreme environments has made archaea the focus of speculation about the possible properties of ________.
Extraterrestrial lifeEuropa (moon)Planetary habitabilityAstrobiology

Question 7: However, oxygen-generating ________ does not occur in any of these organisms.
PlantAlgaePhotosynthesisCell wall

Question 8: [73] Other organic compounds such as alcohols, ________ or formic acid are used as alternative electron acceptors by methanogens.
EthanolOxygenAcetic acidHydrogen peroxide

Question 9: A popular definition of a species in ________ is a set of organisms that can breed with each other and are reproductively isolated from other groups of organisms (i.e. they cannot breed with other species).

Question 10: Some archaea obtain their energy from inorganic compounds such as sulfur or ________ (they are lithotrophs).


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