Exercise Quizzes (See related pages) 1 ________ is the passive movement of molecules as a result of random motion caused by heat. A) Brownian movement B) Dialysis C) Osmosis D) Diffusion 2 Circle correct answers. Molecules diffuse from an area of low / high concentration to an area of low / high concentration. 3 The ________ of diffusion is determined by the steepness of the gradient and other characteristics of the specific molecule in question such as its size, polarity, or solubility. 4 The ________ of diffusion depends on the presence of a gradient of concentration, heat, and pressure. 5 Osmosis is diffusion of water across a differentially permeable membrane. What does differentially permeable mean? 6 What are polar molecules? A) molecules that have positively charged and negatively charged areas B) molecules that have no local areas of positive or negative charge C) molecules that release H+ ions D) molecules that accept H+ ions 7 Diffusion requires energy. A) True B) False 8 In today's lab, what is the model of a differentially permeable membrane that you will use? 9 Phenolphthalein is a ________ indicator. A) glucose B) oxygen C) starch D) pH 10 A hypotonic solution ________. A) is a solution with a relatively lower concentration of solutes B) is a fluid that dissolves substances C) has an equal concentration of solutes compared to another solution D) is a solution with a relatively higher concentration of solutes E) is a dissolved substance in a solution 11 A(n) ________ solution has a relatively higher concentration of solutes compared to another solution. A) isotonic B) hypertonic C) hypotonic D) hyperbolic 12 All molecules display kinetic energy. A) True B) False 13 The ________ variable is the variable that the experimenter actively controls to determine how it influences an observed phenomenon. 14 The ________ variable is the event studied and expected to change in an experiment. 15 The ________ variable is generally graphed on the horizontal or x-axis of a graph. 16 Circle correct answers. Water moves from an area of low / high water potential to an area of low / high water potential. 17 ________ is the bursting of a cell caused by an influx of water. 18 ________ is the pulling away of the cell membrane from the cell wall when a plant cell looses water. 19 What happens to a red blood cell when it is placed in a hypertonic solution? 20 What happens to a plant cell when it is placed in a hypotonic solution? 21 A fish in saltwater is in a ________ solution. 22 Distinguish between diffusion and osmosis.
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