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constantly moving particles spread out randomly, and as a result tend to move from an area where they are more concentrated to an area where they are less concentrated. 10) When the concentration of the solute is the same throughout the system. 11) Above the cell membrane - High concentration, Below the cell membrane - Low concentration 12) Some substances can pass through them and others cannot. Also known as semipermeable membrane. 13) Osmosis is the diffusion of water through a selectively permeable membrane. 14) False 15) Water will stop moving across a membrane then equilibrium is reached. 16) B 17) A 18) C 19) Exerts a pressure on the hypertonic side of the selectively permeable membrane 20) A few molecules seem to pass through the cell membrane much more quickly than they should. They diffuse across it easily. 21) Protein channels act as carriers, making it easy for certain molecules to cross. 22) True 23) Active transport 24) False 25) Endocytosis- The process of taking material into the cell by means of pockets of the cell membrane. The pocket that results breaks loose from the outer portion of the cell membrane and forms a vacuole within the cytoplasm. Phagocytosis- Extensions of cytoplasm surround a particle and package it within a food vacuole. The cell then engulfs it. Exocytosis- The membrane of the vacuole surrounding the material fuses with the cell membrane, forcing the contents out of the cell. 26) When it breaks loose from the membrane, it forms a vacuole within the cytoplasm.

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