True wood is produced only by:
a. giant horsetails
b. conifers
c. accumulated sediments that have compacted over geologic time
d. seed plants
e. seedless vascular plants
d
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Which one of the following represents the flow of information as described by the Central Dogma of Molecular Biology?
A. Information in DNA is transcribed into RNA and then translated into protein. B. Information in DNA is translated into RNA and then transcribed into protein. C. Information in protein is translated into RNA and then stored as DNa. D. Information in RNA is transcribed into DNA and then translated into protein. E. Information in DNA is directly translated into protein.
How might absorption of organic compounds into clays assist in their aggregation and organization
into membrane-bound protocells?
a. Clays contain many minerals in extremely thin layers and readily repel ions, forcing multiple chemical interactions. b. Clays are highly structured, contain water, and store potential energy that could drive the chemical reactions forward. c. Clays lack water, forcing the concentration of the organic molecules and thus driving multiple interactions. d. Clays are extremely resistant to temperature changes and thus would insulate the organic compounds from temperature changes in the atmosphere. e. None of the above statements accurately explain clays’ possible roles in the formation of protocells.
Four of the following statements about turtles are true. Which statement is false?
a. About 300 species of turtles currently exist. b. Turtles do not have teeth. c. Turtle shells are enlarged in marine forms. d. Turtles must return to land to lay eggs. e. Most sea turtle species are highly endangered.
Globally, cigarette smoking kills four million people
annually. That number is expected to increase to _____ million by 2030. a. 10 b. 50 c. 100 d. 150 e. 250