Observing a patient who has been given an experimental drug, you notice that it constricts blood vessels and slows digestion, making its effects similar to those of
A. calcitonin.
B. epinephrine.
C. insulin.
D. glucagon.
E. testosterone.
B. epinephrine.
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In the citric acid cycle, succinate is oxidized to form
A. fumarate. B. oxaloacetate. C. malate. D. succinate. E. citrate.
A pressurized airplane cabin and an oxygen tent over a patient in a hospital both address the need of a person for oxygen. How do these compare?
Select one: a. The oxygen tent increases the air pressure to increase the PO2. b. Airplane cabin pressure lowers the partial pressures for normal breathing. c. Both use the same mechanism to force hemoglobin to increase affinity for oxygen. d. The oxygen tent increases concentration of O2 while the airplane maintains total air pressure without changing concentrations. e. Both increase the PO2 in order to force the exchange of oxygen for carbon dioxide.
The chromatids move toward opposite poles during ________ of mitosis
A) anaphase B) telophase C) metaphase D) prophase E) interphase
Why are "fortified" foods more likely to spoil than are unfortified foods?
A. The addition of vitamins or minerals makes the food more nutritious for microbes as well as humans. B. Vitamins are added to "fortified" foods by adding the microbes that produce the vitamins to the food item. C. Every step of modification or manipulation of food increases the chance for contamination. D. The addition of nutrients creates an osmotic environment suitable for a wide range of microbes. E. The vitamins require a neutral pH environment, which is suitable for many microbes.