Countries engage in trade because
a. the exchange is mutually beneficial.
b. governments force industries to exchange.
c. international law dictates that exchange must take place.
d. All of these.
a. the exchange is mutually beneficial.
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Why do cancer cells induced by DNA viruses preferentially carry copies of viral "early" gene fragments more than "late" genes?
a) Early genes encourage cell cycle arrest b) Early genes integrate into the host genome whereas late genes do not c) Early genes stay silent whereas late genes are actively expressed d) Early genes are responsible for encouraging cell cycle progression into S phase
Which of the following statements is a logical consequence of the second law of thermodynamics?
A. If the entropy of a system increases, there must be a corresponding decrease in the entropy of the universe. B. If there is an increase in the energy of a system, there must be a corresponding decrease in the energy of the rest of the universe. C. Every energy transfer requires activation energy from the environment. D. Every chemical reaction must increase the total entropy of the universe. E. Energy can be transferred or transformed, but it cannot be created or destroyed.
Contained in amino acids, proteins, nucleic acids, chlorophyll.
Choose the letter of the best match: A. nitrogen B. calcium C. potassium D. phosphorus E. magnesium
The female gametophyte in flowering plants is usually consists of
a. a complete pistil. b. seven cells embedded in floral tissues. c. a single ovary. d. a seed. e. shoot parts bearing female flowers.