Evidence from Stanley Miller's experiments and evidence from carbonaceous chondrites collected from meteorites, taken together, most directly support the contention that
a. life can arise under conditions of extreme heat or cold.
b. organic molecules can be synthesized by natural chemical processes.
c. life did not arise on earth, but rather arrived from another planet by meteorite.
d. living organisms are required to produce complex organic compounds.
e. organic compounds require gravity for their formation.
B; Miller's apparatus produced organic compounds under "primitive earth" conditions, that is, chemically, in a sterile environment. Organic material from meteorites comes from space, and must also have been synthesized by something other than the metabolism of living organisms. Taken together, these suggest that organic molecules are the natural products of chemical reactions.
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The transition between the continental shelf and the deep floor is called
a. midocean. b. continental slope. c. shelf break. d. continental margin.
What characteristic of a water molecule accounts for its polarity?
A. its cohesiveness B. its ability to act as a solvent C. its unequal sharing of electrons D. the hydrogen bonding to neighbouring water molecules
If a population of 100,000 microbes has been treated with antimicrobials for 2 minutes and 90% of the population dies per minute, how many microbes remain after 2 minutes?
A. 100,000 B. 10,000 C. 1000 D. 100
What trend do we observe as we look at alternation of generations and plant kingdom evolution?
A) Only gymnosperms show a significant sporophyte generation. B) Only ferns show a significant gametophyte generation. C) The gametophyte generation is dominant in more advanced plants. D) The sporophyte generation is dominant in more advanced plants.