CAMPBELL BIOLOGY-W/MOD.MASTERBIOLOGY
CAMPBELL BIOLOGY-W/MOD.MASTERBIOLOGY
11th Edition
ISBN: 9780134683461
Author: Urry
Publisher: PEARSON
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Chapter 25, Problem 2TYU

The oxygen revolution changed Earth's environment dramatically. Which of the following took advantage of the presence of free oxygen in the oceans and atmosphere?

  • (A) the evolution of cellular respiration, which used oxygen to help harvest energy from organic molecules
  • (B) the persistence of some animal groups in anaerobic habitats
  • (C) the evolution of photosynthetic pigments that protected early algae from the corrosive effects of oxygen
  • (D) the evolution of chloroplasts after early protists incorpo-rated photosynthetic cyanobacteria
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Which of the following steps has not yet been accomplished byscientists studying the origin of life?(A) synthesis of small RNA polymers by ribozymes(B) formation of molecular aggregates with selectivelypermeable membranes(C) formation of protocells that use DNA to direct thepolymerization of amino acids(D) abiotic synthesis of organic molecules

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