Organisms that evolved the ability to use H20 as a donor of electrons and hydrog

Question

Organisms that evolved the ability to use H20 as a donor of electrons and hydrogen for the photosynthetic conversion of CO2 to organic compounds radically changed Earth by producing a. sugar. b. cellulose c. H2. d. O2 RNA is believed to have been the initial genetic system because it can a. form a stable double helix with a complementary nucleic acid strand. b. catalyze the polymerization of nucleotides into another RNA strand. c. form ribosomes. d. transfer amino acids to ribosomes. The initial importance of a membrane enclosing self-replicating RNA molecules and associated proteins was that it a. maintained these molecules as a unit capable of reproduction and evolution. b. provided sites for proteins to function. c. transported materials in and out of the compartment. d. kept other molecules out of the compartment organelles such as mitochondria and chloroplasts are thought to have originated in eukaryotic cells via a process called a. phagocytosis b. endosymbiosis. c. endocytosis. d. exocytosis.

Explanation / Answer

Answer D: Oxygen Answer B: catalyze the polymerization of nucleotides into another RNA strand Answer A: maintained these molecules as a unit capable of reproduction and evolution Answer B: endosymbiosis

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