The cooperative activity of drugs such as beta-lactam antibiotics and clavulanic acid, a ?-lactamase inhibitor, is known as
A) cross resistance.
B) antimetabolism.
C) synergism.
D) selective toxicity.
E) chemotherapy.
C
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Fish and shellfish resources are considered:
a. inexhaustible. b. finite. c. renewable. d. transferable. e. inorganic.
By the eighth week in humans
a. the embryo looks distinctly human. b. the neural tube is complete. c. upper and lower limbs have formed, and individual fingers and toes have separated from each other. d. male or female reproductive structures are forming. e. all of these are true.
Which sentence best describes the difference between plant cell division and animal cell division?
a. In animal cells, but not plant cells, cytokinesis is accomplished by formation of a cleavage furrow. b. In animal cells, replication of chromosomes occurs during interphase, while in plant cells replication occurs when the nuclear envelope disintegrates. c. In plant cells, centrosomes have an important role in spindle formation, while in animal cells centrosomes do not function during cell division. d. In plant cells, but not animal cells, cytokinesis is accomplished by formation of a cleavage furrow.
When nitrogen oxides and sulfur dioxide combine with water vapor in the air, they are converted to nitric acid and sulfuric acid, respectively. This precipitation that then falls to the Earth is known as
A) decomposition acid. B) acid fog. C) acid deposition. D) acid precipitation. E) nitrogen precipitation.