Posted: February 22nd, 2017
18. In an experiment, a researcher counts the number of oxygen bubbles produced by water plants placed under different colors of light. The researcher finds that water plants placed under white light release more oxygen bubbles than water plants placed under red light. Which of the following statements is best supported based on the observation? A. Light can break up water molecules to form oxygen. B. White light increases photosynthesis in plants. C. Red light has no affect on the release of oxygen from water plants. D. An increase in temperature decreases the amount of oxygen produced by plants. 19. When normal atmospheric conditions are present, water is constantly being cycled between liquid and gaseous states by which of the following pairs of processes? A. Turgor pressure and filtration B. Melting point and condensation C. Evaporation and condensation D. Filtration and evaporation
20. A scientist has noted a possible relationship between a certain chemical substance found in fish and the occurrence of kidney failure in humans. Which of the following preliminary steps should the scientist take before conducting a controlled experiment? A. Establish a cause and effect relationship between the substance and the outcome. B. Review the literature to determine what other research is available on this topic. C. Write a research grant proposal to the appropriate federal funding agency. D. Distribute letters of consent to human subjects who will be used in the research.
21. In the digestive tract, mouth is to bolus as A. stomach is to chyme. B. gallbladder is to insulin. C. small intestine is to carbohydrate. D. esophagus is to peristalsis.
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