“Prebiotic soup” refers to
a. the interior contents of protocells.
b. the cytoplasm of early prokaryotic cells.
c. the mix of gases in the atmosphere that gave rise to the first organic molecules.
d. the polymerized slime coating ancient clay particles.
e. the accumulation of organic molecules that formed in the oceans before there was life on
earth.
E
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Plasmid DNA having one EcoRI recognition sequence is treated with EcoRI restriction endonuclease. Following gel electrophoresis, how many bands should be visible on the gel?
A. Zero B. Four C. One D. Two
The Burgess Shale preserves a remarkable fossil record of:
A. delicate flowers and mushrooms from the early invasion of land plants. B. marine life during initial diversification of animals in the Cambrian Period 505 million years ago. C. plants, insects, and mammals around 50 million years ago, as the age of mammals began. D. the tracks of dinosaurs walking on land. E. molecular evidence of bacteria and other organisms.
Which component is the oxidizing agent in the following chemical reaction?
4 Fe + 3 O2 ? 2 Fe2O3 a. rust b. iron c. water d. oxygen e. hydrogen
________ serves to narrow niche breadth.
A. Symbiosis B. Predation C. Competition D. Commensalism