Biology (Mader), 10th Edition

Chapter 18: Origin and History of Life

Pre-Test

1
The primitive atmosphere had little if any _____.
A)water
B)free oxygen
C)carbon dioxide
D)nitrogen
2
When O2 attaches to organic molecules, _____.
A)they form polymers
B)it breaks them apart
C)they become radioactive
D)they dissolve in water more easily
3
Evidence that organic molecules could be synthesized from the inorganic molecules methane, carbon dioxide, ammonia, hydrogen gas, heat, and energy was provided by _____.
A)Miller
B)Cuvier
C)Wallace
D)Watson and Crick
4
The earliest formed organic molecules would have _____.
A)been reduced by free oxygen
B)decayed
C)accumulated in the oceans
D)All of these
5
If primordial earth lacked free O2, as is speculated, then the first living organisms must have ______.
A)been photosynthetic
B)formed on land
C)practiced fermentation (anaerobic metabolism)
D)practiced glycolysis and cellular respiration
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