Consider a mutant organism that is unable to make the amino acid arginine. Knowing that the
metabolic pathway to production of arginine is ornithine ? citrulline ? arginosuccinate ? arginine,
you test the ability of the mutant to grow in the presence of each one of these compounds, providing
just one of the compounds in each of your tests. You find that the mutant can grow in the presence of
arginosuccinate or arginine, but not in the presence of citrulline or ornithine. From this you can
conclude that the product of the gene mutated in the mutant is most directly involved in production of
____.
a. arginine from ornithine
b. arginosuccinate from citrulline
c. citrulline from ornithine
d. arginine from arginosuccinate
e. arginosuccinate from ornithine
B
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Biosensors involve linking which of the following with electronic circuitry?
A. Microorganisms B. Microbially derived enzymes C. Gene chips D. Both microorganisms and gene chips are used with electronic circuitry. E. Both microorganisms and microbially derived enzymes are used with electronic circuitry. F. Both gene chips and microbially derived enzymes are used with electronic circuitry.
Which process employs exposing cells cultured in the laboratory to DNA with a gene of interest?
a. transformation b. Transfection c. DNA fingerprinting d. polymerase chain reaction e. gel electrophoresis
At present the human population is
A. in the death phase B. growing rapidly C. stable D. in the lag phase
"N" is the chemical symbol for
A. nickel. B. neon. C. nitrogen. D. magnesium. E. copper.