Quiz5_Answers

Quiz5_Answers - 1. Which gas was least abundant in Earth's...

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1. Which gas was least abundant in Earth’s early atmosphere, prior to 2 billion years ago? a. NH3 b. O2 c. CH4 d. H2O 2. Which free-living cells were the earliest contributors to the formation of Earth’s oxidizing atmosphere? a. chloroplasts b. mitochondria c. endosymbionts d. cyanobacteria 3. Which of the following has not yet been synthesized in laboratory experiments studying the origin of life? a. liposomes b. oligopeptides and other oligomers c. amino acids d. protobionts that use DNA to program protein synthesis 4. Which is the bacterial structure that acts as a selective barrier, allowing nutrients to enter the cell and wastes to leave the cell? a. pili b. capsule c. plasma membrane d. cell wall 5. Which of the following statements provides the strongest evidence that prokaryotes evolved before eukaryotes? a. meteorites that have struck Earth b. abiotic laboratory experiments that produced liposomes c. The oldest fossilized cells resemble prokaryotes. d.
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This note was uploaded on 03/30/2009 for the course BISC 120Lg taught by Professor 11:00-01:50pm during the Fall '06 term at USC.

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Quiz5_Answers - 1. Which gas was least abundant in Earth's...

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