The most critical step in the Gram stain is the application of the:
a. safranin.
b. crystal violet.
c. Gram's iodine.
d. Gram's decolorizer.
D
Decolorizer is the most critical step; overdecolorization or underdecolorization can occur, causing false results.
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Which statement is true about the effect of stress on a population?
a. Plants compete more in an ideal environment. b. Plants compete more in a stressful environment. c. Only abiotic factors influence populations. d. Stressful environments brought about by man do not effect populations. e. Stressful environments brought about by nature do not effect populations.
In the systemic arteries, the partial pressure of oxygen is approximately ________, and hemoglobin is approximately ________ saturated with oxygen.
A) 40 mm Hg : 75% B) 100 mm Hg : 75% C) 60 mm Hg : 50% D) 40 mm Hg : 50% E) 100 mm Hg : 98%
Population growth is fastest in which stage of the
demographic model? a. preindustrial b. transitional c. industrial d. postindustrial e. pretransitional
During the process of gel electrophoresis, the DNA fragments migrate due to the effects of ____
a. gravity b. vibrations c. electrical charge d. magnetic attraction e. centrifugal force