A technique that separates a readable pattern of DNA fragments is ________.
A. genetic engineering
B. biotechnology
C. recombinant DNA
D. gel electrophoresis
E. gene probes
Answer: D
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It has been hypothesized that fungi and plants have a mutualistic relationship because fungi provide critical nitrogen for the plants' use. How do we know this happens? In experiments using radioactively labeled _____
A) nitrogen, plants acquired more radioactive nitrogen when they were associated with fungi B) nitrogen, labeled nitrogen showed up in fungi when the fungi were with symbiotic with plants C) nitrogen, when plants were associated with fungi, the plants could fix labeled nitrogen D) proteins, plants transported labeled proteins to adjacent fungi
Once integrated, phage DNA can remain in the prophage state as long as
A. the bacteria is frequently plated on new media. B. certain phage genes are excised. C. certain phage genes are repressed. D. bacterial repressor genes are activated.
Which term denotes the conditions, resources, and interactions necessary for survival and reproduction of a species?
a. habitat b. niche c. carrying capacity d. community e. ecosystem
Which factor has dramatically decreased infant mortality in human populations?
A) a shift from an agricultural to an industrial economy B) the use of pesticides to reduce mosquito populations C) the choice made by educated women to have fewer children D) an increase in poverty in developed countries