Which of the following methods would be the most suitable to assess the relative purity of a protein in a sample you have prepared?
(a) gel-filtration chromatography
(b) gel electrophoresis
(c) western blot analysis
(d) ion-exchange chromatography
(b)
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The type of cellular response to a signal does NOT depend on:
A. the type of receptor being expressed in the cell. B. the type of intracellular signal-transduction proteins being expressed in the cell. C. other signals to which the cell is concurrently responding. D. the type of terminator proteins being expressed in the cell. E. All of these choices are correct.
Which of the following animals would have access to the most oxygen in its environment?
a. a termite living in its underground nest b. a snow leopard living high in the Himalayan mountains c. a zebra living close to sea level d. a deep-sea ray
Who developed the modern endosymbiotic theory?
a. Charles Darwin b. Lynn Margulis c. Richard Dickerson d. Wendy Johnson e. Stanley Miller
The DNA strands that will be together in the
new DNA molecules are a. A ? D and B ? C. b. A ? B and C ? D. c. A ? C and B ? D. d. A ? D ? B and A ? D ? C. e. A ? B ? C ? D.