Archaea Knowledge-Based Download PDF

Questions

1. 1.

   Which of the following pigments is utilized by certain extreme halophilic archaea to generate a proton gradient for ATP synthesis in the absence of chlorophyll?

   • A) Phycocyanin
   • B) Bacteriorhodopsin
   • C) Luciferin
   • D) Plastoquinone
2. 2.

   Members of the domain Archaea classified as extreme thermoacidophiles are typically found thriving in which of the following natural environments?

   • A) Hypersaline inland salt lakes
   • B) Hot, acidic geothermal springs and hydrothermal vents
   • C) Deep-sea anoxic sediments where methane accumulates
   • D) Glacial ice sheets and permafrost soils
3. 3.

   Which of the following molecular characteristics is shared between organisms in the domain Archaea and the domain Eukarya, but is generally absent in Bacteria?

   • A) Peptidoglycan polymers forming the rigid cell wall structure
   • B) Ester-linked unbranched fatty acids in the cell membrane
   • C) Histone proteins associated with genomic DNA packaging
   • D) Initiation of protein synthesis using formylmethionine
4. 4.

   Which of the following biological processes is a unique metabolic capability found exclusively among certain organisms of the domain Archaea?

   • A) Oxygenic photosynthesis
   • B) Lactic acid fermentation
   • C) Aerobic cellular respiration
   • D) Methanogenesis
5. 5.

   Which of the following cellular features distinguishes members of the domain Archaea from members of the domain Bacteria?

   • A) Membrane phospholipids composed of branched hydrocarbon chains joined to glycerol by ether linkages
   • B) A rigid cell wall made primarily of peptidoglycan
   • C) The absence of membrane-bound organelles and a defined nucleus
   • D) The presence of 70S ribosomes functioning in cytoplasmic protein synthesis