Some anoxygenic photosynthetic bacteria use ________ as their electron source.
A. hydrogen
B. hydrogen sulfide
C. sulfur
D. All of these choices are correct.
Answer: D
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Bacteria synthesize CDP-diacylglycerol in order to build ________, a major cell membrane phospholipid component.
A. lipopolysaccharide B. peptidoglycan C. lipid rafts D. phosphatidylethanolamine
The principal driving force for guttation is ____
a. passive transport b. sunlight c. root pressure d. upward pressure as sugar is forced into the roots e. pumping by the xylem cells
Which of the following NOT is an example of a respiratory surface?
a. amphibian skin b. human lungs c. fish gills d. ctenophore body surfaces e. fish scales
Which of the following statements describes why you respond to your alarm clock in the morning by
turning it off? a. The reticular activating system sends a stimulus to the cerebral cortex. b. The number of alpha waves emitted by the brain increases. c. The number of theta waves emitted by the brain increases. d. The cortex of the cerebellum is stimulated. e. The limbic system is stimulated.