Which of the following posits that the metabolic reactions that led to the first cells took place on the porous surface of iron-sulfide-rich rocks at hydrothermal vents?
A. Hydrothermal vent hypothesis
B. Iron–sulfur world hypothesis
C. RNA world hypothesis
D. Ribozyme hypothesis
E. Protoevolutionary hypothesis
Answer: B
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The colonization of land by animals:
A. preceded the presence of plant species on land. B. took place billions of years ago. C. was made more easy by high atmospheric levels of carbon dioxide. D. may have taken place independently by a variety of species descended from aquatic environments.
The male gametophyte becomes
a. ovules. b. seeds. c. pollen grains. d. cones. e. sperm cells.
What is the correct format for the scientific name of corn?
a. zea Mays b. Zea Mays c. Zea mays
d. Zeamays e. zea mays
A mammoth frozen in the Arctic tundra of Siberia would be an example of which type of fossilization?
a) Mummification b) Permineralization c) Carbonization d) Replacement