Biological Membranes 0.0 / 5 ? BiologyBiological molecules, organic chemistry and biochemistryA2/A-levelOCR Created by: lyssamaryanneCreated on: 18-12-18 09:26 What is osmosis? the net movement of water molecules from a region of high water potential to a region of low water potentially through a partially permeable membrane 1 of 14 What is water potential? measure of the concentration of water molecules that are able to diffuse 2 of 14 What is the correct measurement for pure water? 0kPa 3 of 14 What is meant by a hypotonic solution? where the solute concentration is greater outside the cell 4 of 14 What is an isotonic solution? a solution where the concentration of solutes is the same as another solution across a semipermeable membrane 5 of 14 What is meant by a hypertonic solution? where the the solute concentration is greater inside the cell 6 of 14 What is meant by cytolysis? where the (animal) cell membrane bursts 7 of 14 What is meant by crenation? where the (animal) cell reduces in size 8 of 14 What is meant by turgor? where there is pressure against the cell wall meaning no more water can enter the plant cell 9 of 14 What is meant by plasmolysis? where the cell membrane is pulled away from the cell wall 10 of 14 What is active transport? the movement of molecules against a concentration gradient that uses energy which drives protein carriers within the membrane 11 of 14 Which processes have movement down the concentration gradient? osmosis, facilitated and diffusion 12 of 14 Which process requires ATP? active transport 13 of 14 Which processes are proteins involved in? facilitated diffusion and active transport 14 of 14
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