1) Which of the following best describes simple diffusion? a) Movement of molecules from a region of low concentration to high concentration through a membrane b) Passive transport of molecules from a high concentration area to a low concentration area c) Movement of water across a membrane from a high solute concentration to a low solute concentration d) Transport of molecules with the help of protein carriers across a membrane 2) Which type of molecules can pass through a cell membrane by simple diffusion? a) Large proteins and carbohydrates b) Ions like sodium (Na+) and potassium (K+) c) Small nonpolar molecules, such as oxygen and carbon dioxide d) Glucose and amino acids 3) Simple diffusion is a form of: a) Active transport b) Passive transport c) Facilitated diffusion d) Osmosis 4) Which factor does NOT affect the rate of simple diffusion? a) Concentration gradient b) Membrane thickness c) The energy supplied by ATP d) Temperature 5) During simple diffusion, molecules move in which direction along the concentration gradient? a) Against the concentration gradient b) From low concentration to high concentration c) Randomly, without regard to concentration d) From high concentration to low concentration 6) Which of the following is an example of a molecule that commonly moves across cell membranes by simple diffusion? a) Water b) Glucose c) Oxygen d) Sodium ions 7) In simple diffusion, when does the movement of molecules stop? a) When all molecules have moved to one side of the membrane b) When there is an equal concentration of molecules on both sides of the membrane c) When the ATP supply is depleted d) It never stops; molecules continuously move across the membrane 8) Which condition would increase the rate of simple diffusion? a) Increasing the size of the diffusing molecules b) Increasing the concentration of molecules on one side of the membrane c) Decreasing the temperature d) Decreasing the concentration gradient

Simple Diffusion Quiz

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