Origins Of Life, Bacteria, Protists, Plants, Fungi

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Origins of life, Bacteria, Protists, Plants, Fungi Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. ____ 1. Which putative early Earth condition did Miller and Urey's experimental apparatus not attempt to simulate directly? a. | presence of water vapor | b. | intense lightning storms | c. | warm seas | d. | intense UV bombardment | e. | reducing atmosphere | ____ 2. The early atmosphere of Earth probably retained all of the following molecules in substantial amounts except a. | H2. | b. | CH4. | c. | CO2. | d. | N2. | e. | H2O. | ____ 3. Which of the following has not yet been synthesized in laboratory experiments studying the origin of life? a. | liposomes | b. | liposomes with selectively permeable membranes | c. | oligopeptides and other oligomers | d. | protobionts that use DNA to program protein synthesis | e. | amino acids | ____ 4. Although absolute distinctions between the "most evolved" protobiont and the first living cell are unclear, biologists generally agree that one major difference is that protobionts could not a. | possess a selectively permeable membrane boundary. | b. | perform osmosis. | c. | grow in size. | d. | perform controlled, precise reproduction. | e. | absorb compounds from the external environment. | ____ 5. Which of the following statements about the origin of genetic material is most probably correct? The first genes were a. | DNA produced by reverse transcriptase from abiotically produced RNA. | b. | DNA molecules whose information was transcribed to RNA and later translated in polypeptides. | c. | self-replicating, catalytic RNA molecules. | d. | RNA produced by autocatalytic, proteinaceous enzymes called ribozymes. | e. | protobionts produced by dehydration syntheses of nucleic acids. | ____

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