Which of the following is true of viruses in the extracellular phase?
A. They possess many different enzymes and they can reproduce independently of living cells but only at a slow rate.
B. They can reproduce independently of living cells but only at a slow rate.
C. They possess many different enzymes.
D. They behave as a macromolecular complex and are no more alive than are ribosomes.
Answer: D
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In creating a recombinant DNA molecule, what are two methods that prevent re-ligation of the cloning vector that contains no insert DNA?
What will be an ideal response?
Which of the following statements best summarizes the differences between RNA and DNA?
a. RNA is a protein and DNA is a nucleic acid. b. DNA is a polymer and RNA is a monomer. c. DNA comprises the genes, while RNA is a direct participant in the process of protein synthesis. d. RNA is a single-stranded form of DNA. e. DNA is the primary energy currency of all cells.
What are the prevailing winds in the United States?
A. Westerlies B. Easterlies C. Southeast tradewinds D. Northeast tradewinds E. Doldrums
The first australopithecine fossils were unearthed in
A. Asia. B. Europe. C. South America. D. North America. E. Southern Africa.