The stomata open depending on the following conditions, except ____.
A. when the guard cells are swollen with water
B. decreased turgor in guard cells
C. low carbon dioxide level in the leaf
D. voltage change in guard cell membranes stimulated by sunlight
E. hot, dry environment
Answer: B
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An oxidase test was performed on two organisms for quality control purposes. Pseudomonas aeruginosa and Stenotrophomonas maltophilia tested positive and negative, respectively. Which of the following statements explains this discrepancy?
a. The oxidase reagent is most likely expired. b. The organisms are most likely old and therefore are not properly reacting. c. These organisms are poor choices for quality control purposes; both are oxi-dase-negative organisms. d. No discrepancy is present. The correct results are obtained.
Isotopes that are unstable and decay when their nucleus breaks up into elements with lower atomic numbers, emitting significant amounts of energy in the process, are called:
A. energetic B. ionic C. radioactive D. isometric
The steady charge difference across the plasma membrane is called the
a. action potential. b. energy potential. c. electrolyte potential. d. resting membrane potential. e. kinetic potential.
Although the researcher estimated fitness by survival, he could have also used another proxy for fitness, such as mating success.
a. true b. false