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Archaea Knowledge-Based Practice

Biology · Diversity of Life · Biology · Microorganisms & Viruses

5 Biology practice questions on Archaea. Questions that assess core concepts and understanding.

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Questions

  1. 1.

    Which structural feature of pseudomurein in certain archaeal cell walls prevents it from being hydrolyzed by lysozyme?

    • A) The presence of beta-1,3-glycosidic linkages instead of beta-1,4-glycosidic linkages
    • B) The inclusion of D-amino acids in cross-linking peptide chains instead of L-amino acids
    • C) The incorporation of cellulose microfibrils embedded within a pectin matrix
    • D) The presence of ester-linked fatty acid bilayers surrounding the glycan polymer
  2. 2.

    Which light-driven proton-pumping protein enables extreme halophilic archaea to generate ATP from sunlight without using chlorophyll?

    • A) Bacteriorhodopsin
    • B) Bacteriochlorophyll
    • C) Phycocyanin
    • D) Chlorophyll a
  3. 3.

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

    • A) Use of methionine as the initiator amino acid during translation
    • B) Presence of peptidoglycan as a major structural cell wall component
    • C) Formation of membrane lipids containing ester-linked unbranched fatty acids
    • D) Possession of a simple RNA polymerase composed of four to five core subunits
  4. 4.

    Which group of Archaea consists of obligate anaerobes that produce methane gas as an end product of their cellular metabolism?

    • A) Methanogens
    • B) Extreme halophiles
    • C) Thermoacidophiles
    • D) Psychrophiles
  5. 5.

    Which of the following cellular characteristics uniquely distinguishes organisms belonging to the domain Archaea from both Bacteria and Eukarya?

    • A) Presence of circular double-stranded DNA located in an unenclosed nucleoid region
    • B) Presence of a thick peptidoglycan meshwork providing structural support to the cell wall
    • C) Presence of 70S ribosomes functioning completely independently of eukaryotic-like transcription factors
    • D) Presence of branched hydrocarbon chains connected to glycerol by ether linkages in membrane lipids

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