If a carbon atom is a stereocenter, which of the following statements must be true about that carbon?
A) It has four single bonds.
B) It has a double bond and two single bonds.
C) It has two double bonds.
D) Any of these bonding arrangements can be associated with a stereocenter.
A
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Which of the following is a good analogy for planetary differention?
A) scrambling an egg to make an omelet B) a salad dressing of oil and vinegar C) throwing a snowball through a heavy blizzard of snowflakes D) dust particles clumping together under your bed
Roughly ____% of the biomass consumed by any consumer is stored in the consumer as flesh
A) 5 B) 10 C) 15 D) 25
What is the significance of stromatolites?
a) They are composed of benthic patches of bacteria found at hydrothermal vents. b) Cyanobacteria produce carbonate structures in warm shallow seas that can date back to 3 billion years ago. c) They are composed of siliceous deposits of diatoms and dinoflagellates. d) They are composed of biogenous deposits of foraminiferans and coccolithophores.
The three major mobile belts in North America during the Late Paleozoic were the ____
a. Appalachian, Ouachita, and Cordilleran b. Kaskaskia, Ouachita, and Cordilleran c. Appalachian, Silurian, and Cordilleran d. Kaskaskia, Silurian, and Cordilleran e. Appalachian, Ouachita, and Taconic