What is meant when a bacterium is said to become "resistant" to an antibiotic?
a. The antibiotic kills or inhibits the bacterium.
b. The antibiotic is metabolized by the bacterium, providing more energy for growth of the cell.
c. The bacterium is neither killed nor inhibited by the antibiotic.
d. The antibiotic mutates in a way that benefits the bacterium.
Answer: c. The bacterium is neither killed nor inhibited by the antibiotic.
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Skeletal muscle contraction begins when calcium ions bind to _____
A) energized cross-bridges B) myosin C) actin D) acetylcholine receptors E) troponin
Excessive iron absorption and accumulation to toxic levels is associated with _____
A) excessive blood volume B) a liver abnormality that results in a decreased number of red blood cells C) various forms of inherited or acquired anemia D) the genetic disorder known as hemochromatosis E) menstruation and menopause
The main difference between germ-line gene therapy and somatic gene therapy is
a. only somatic gene therapy can result in the modified genes being passed to the next generation. b. only germ-line gene therapy will have results limited to the current generation. c. in germ-line gene therapy, the gametes are altered; in somatic gene therapy, that doesn't happen. d. in somatic gene therapy, the gametes are altered; in germ-line gene therapy, only the body cells are altered. e. only germ-line gene therapy is ethical for research purposes in rodents.
In the reactions of glycolysis, pyruvate oxidation, and the citric acid cycle, chemical energy is transferred to the bonds in:
a. ATP b. All of these choices are correct. c. fats d. electron carriers e. c and d f. a and d