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2.2.6 Movement through Cell Membranes

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1 2.2.6 Movement through Cell Membranes
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2 Q. Water enters the outermost cells of the root by osmosis
Q. Water enters the outermost cells of the root by osmosis. What does this tell you about the cell sap of these outermost cells? Active transport Movement of molecules against a concentration gradient using energy Substances can be allowed or prevented in or out Allowing some substances to pass through Movement of molecules from area of high concentration to area of lower concentration Support Bacteria lose water by osmosis, this leads to inactivity or death Movement of water along a concentration gradient through a selectively permeable membrane Vacuole; Cell wall; Cell sap Chloroplast; Mitochondrion; Nucleus; Vacuole No energy (ATP) required Visking tubing Controlling the water/salt balance within an organism Osmosis Water movement between cells or from soil to root Diffusion; Osmosis; Active transport Oxygen; Glucose; Water; Amino acids; Phosphate; Iron Water; Sugar; Sap; Salt(s); Protein FALSE TRUE Pressure of cell contents on cell wall Wilting Lower water concentration; Higher solute concentration Root hairs Xylem

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4 Q. Osmosis has been described as a special case of diffusion
Q. Osmosis has been described as a special case of diffusion. Explain why. Active transport Movement of molecules against a concentration gradient using energy Substances can be allowed or prevented in or out Allowing some substances to pass through Movement of molecules from area of high concentration to area of lower concentration Support Bacteria lose water by osmosis, this leads to inactivity or death Movement of water along a concentration gradient through a selectively permeable membrane Vacuole; Cell wall; Cell sap Chloroplast; Mitochondrion; Nucleus; Vacuole No energy (ATP) required Visking tubing Controlling the water/salt balance within an organism Osmosis Water movement between cells or from soil to root Diffusion; Osmosis; Active transport Oxygen; Glucose; Water; Amino acids; Phosphate; Iron Water; Sugar; Sap; Salt(s); Protein FALSE TRUE Pressure of cell contents on cell wall Wilting Lower water concentration; Higher solute concentration Root hairs Xylem

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6 Q. What is meant by a selectively permeable membrane?
Active transport Movement of molecules against a concentration gradient using energy Substances can be allowed or prevented in or out Allowing some substances to pass through Movement of molecules from area of high concentration to area of lower concentration Support Bacteria lose water by osmosis, this leads to inactivity or death Movement of water along a concentration gradient through a selectively permeable membrane Vacuole; Cell wall; Cell sap Chloroplast; Mitochondrion; Nucleus; Vacuole No energy (ATP) required Visking tubing Controlling the water/salt balance within an organism Osmosis Water movement between cells or from soil to root Diffusion; Osmosis; Active transport Oxygen; Glucose; Water; Amino acids; Phosphate; Iron Water; Sugar; Sap; Salt(s); Protein FALSE TRUE Pressure of cell contents on cell wall Wilting Lower water concentration; Higher solute concentration Root hairs Xylem

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8 Q. Give locations in a cell at which there is a selectively permeable membrane.
Active transport Movement of molecules against a concentration gradient using energy Substances can be allowed or prevented in or out Allowing some substances to pass through Movement of molecules from area of high concentration to area of lower concentration Support Bacteria lose water by osmosis, this leads to inactivity or death Movement of water along a concentration gradient through a selectively permeable membrane Vacuole; Cell wall; Cell sap Chloroplast; Mitochondrion; Nucleus; Vacuole No energy (ATP) required Visking tubing Controlling the water/salt balance within an organism Osmosis Water movement between cells or from soil to root Diffusion; Osmosis; Active transport Oxygen; Glucose; Water; Amino acids; Phosphate; Iron Water; Sugar; Sap; Salt(s); Protein FALSE TRUE Pressure of cell contents on cell wall Wilting Lower water concentration; Higher solute concentration Root hairs Xylem

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10 Q. What is diffusion? Active transport Support
Movement of molecules against a concentration gradient using energy Substances can be allowed or prevented in or out Allowing some substances to pass through Movement of molecules from area of high concentration to area of lower concentration Support Bacteria lose water by osmosis, this leads to inactivity or death Movement of water along a concentration gradient through a selectively permeable membrane Vacuole; Cell wall; Cell sap Chloroplast; Mitochondrion; Nucleus; Vacuole No energy (ATP) required Visking tubing Controlling the water/salt balance within an organism Osmosis Water movement between cells or from soil to root Diffusion; Osmosis; Active transport Oxygen; Glucose; Water; Amino acids; Phosphate; Iron Water; Sugar; Sap; Salt(s); Protein FALSE TRUE Pressure of cell contents on cell wall Wilting Lower water concentration; Higher solute concentration Root hairs Xylem

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12 Q. Why is diffusion alternatively known as passive transport?
Active transport Movement of molecules against a concentration gradient using energy Substances can be allowed or prevented in or out Allowing some substances to pass through Movement of molecules from area of high concentration to area of lower concentration Support Bacteria lose water by osmosis, this leads to inactivity or death Movement of water along a concentration gradient through a selectively permeable membrane Vacuole; Cell wall; Cell sap Chloroplast; Mitochondrion; Nucleus; Vacuole No energy (ATP) required Visking tubing Controlling the water/salt balance within an organism Osmosis Water movement between cells or from soil to root Diffusion; Osmosis; Active transport Oxygen; Glucose; Water; Amino acids; Phosphate; Iron Water; Sugar; Sap; Salt(s); Protein FALSE TRUE Pressure of cell contents on cell wall Wilting Lower water concentration; Higher solute concentration Root hairs Xylem

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14 Q. Explain the biological basis for the use of high sugar or high salt concentrations in the preservation of food. Active transport Movement of molecules against a concentration gradient using energy Substances can be allowed or prevented in or out Allowing some substances to pass through Movement of molecules from area of high concentration to area of lower concentration Support Bacteria lose water by osmosis, this leads to inactivity or death Movement of water along a concentration gradient through a selectively permeable membrane Vacuole; Cell wall; Cell sap Chloroplast; Mitochondrion; Nucleus; Vacuole No energy (ATP) required Visking tubing Controlling the water/salt balance within an organism Osmosis Water movement between cells or from soil to root Diffusion; Osmosis; Active transport Oxygen; Glucose; Water; Amino acids; Phosphate; Iron Water; Sugar; Sap; Salt(s); Protein FALSE TRUE Pressure of cell contents on cell wall Wilting Lower water concentration; Higher solute concentration Root hairs Xylem

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16 Q. What did you use as the selectively permeable membrane in your investigation of osmosis?
Active transport Movement of molecules against a concentration gradient using energy Substances can be allowed or prevented in or out Allowing some substances to pass through Movement of molecules from area of high concentration to area of lower concentration Support Bacteria lose water by osmosis, this leads to inactivity or death Movement of water along a concentration gradient through a selectively permeable membrane Vacuole; Cell wall; Cell sap Chloroplast; Mitochondrion; Nucleus; Vacuole No energy (ATP) required Visking tubing Controlling the water/salt balance within an organism Osmosis Water movement between cells or from soil to root Diffusion; Osmosis; Active transport Oxygen; Glucose; Water; Amino acids; Phosphate; Iron Water; Sugar; Sap; Salt(s); Protein FALSE TRUE Pressure of cell contents on cell wall Wilting Lower water concentration; Higher solute concentration Root hairs Xylem

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18 Q. What is active transport?
Movement of molecules against a concentration gradient using energy Substances can be allowed or prevented in or out Allowing some substances to pass through Movement of molecules from area of high concentration to area of lower concentration Support Bacteria lose water by osmosis, this leads to inactivity or death Movement of water along a concentration gradient through a selectively permeable membrane Vacuole; Cell wall; Cell sap Chloroplast; Mitochondrion; Nucleus; Vacuole No energy (ATP) required Visking tubing Controlling the water/salt balance within an organism Osmosis Water movement between cells or from soil to root Diffusion; Osmosis; Active transport Oxygen; Glucose; Water; Amino acids; Phosphate; Iron Water; Sugar; Sap; Salt(s); Protein FALSE TRUE Pressure of cell contents on cell wall Wilting Lower water concentration; Higher solute concentration Root hairs Xylem

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20 Q. Name two substances that enter a human muscle cell by diffusion.
Active transport Movement of molecules against a concentration gradient using energy Substances can be allowed or prevented in or out Allowing some substances to pass through Movement of molecules from area of high concentration to area of lower concentration Support Bacteria lose water by osmosis, this leads to inactivity or death Movement of water along a concentration gradient through a selectively permeable membrane Vacuole; Cell wall; Cell sap Chloroplast; Mitochondrion; Nucleus; Vacuole No energy (ATP) required Visking tubing Controlling the water/salt balance within an organism Osmosis Water movement between cells or from soil to root Diffusion; Osmosis; Active transport Oxygen; Glucose; Water; Amino acids; Phosphate; Iron Water; Sugar; Sap; Salt(s); Protein FALSE TRUE Pressure of cell contents on cell wall Wilting Lower water concentration; Higher solute concentration Root hairs Xylem

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22 Q. Suggest an advantage to the cell of having a selectively permeable membrane.
Active transport Movement of molecules against a concentration gradient using energy Substances can be allowed or prevented in or out Allowing some substances to pass through Movement of molecules from area of high concentration to area of lower concentration Support Bacteria lose water by osmosis, this leads to inactivity or death Movement of water along a concentration gradient through a selectively permeable membrane Vacuole; Cell wall; Cell sap Chloroplast; Mitochondrion; Nucleus; Vacuole No energy (ATP) required Visking tubing Controlling the water/salt balance within an organism Osmosis Water movement between cells or from soil to root Diffusion; Osmosis; Active transport Oxygen; Glucose; Water; Amino acids; Phosphate; Iron Water; Sugar; Sap; Salt(s); Protein FALSE TRUE Pressure of cell contents on cell wall Wilting Lower water concentration; Higher solute concentration Root hairs Xylem

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24 Q. Explain the term turgor.
Active transport Movement of molecules against a concentration gradient using energy Substances can be allowed or prevented in or out Allowing some substances to pass through Movement of molecules from area of high concentration to area of lower concentration Support Bacteria lose water by osmosis, this leads to inactivity or death Movement of water along a concentration gradient through a selectively permeable membrane Vacuole; Cell wall; Cell sap Chloroplast; Mitochondrion; Nucleus; Vacuole No energy (ATP) required Visking tubing Controlling the water/salt balance within an organism Osmosis Water movement between cells or from soil to root Diffusion; Osmosis; Active transport Oxygen; Glucose; Water; Amino acids; Phosphate; Iron Water; Sugar; Sap; Salt(s); Protein FALSE TRUE Pressure of cell contents on cell wall Wilting Lower water concentration; Higher solute concentration Root hairs Xylem

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26 Q. Give an example of osmosis in plants.
Active transport Movement of molecules against a concentration gradient using energy Substances can be allowed or prevented in or out Allowing some substances to pass through Movement of molecules from area of high concentration to area of lower concentration Support Bacteria lose water by osmosis, this leads to inactivity or death Movement of water along a concentration gradient through a selectively permeable membrane Vacuole; Cell wall; Cell sap Chloroplast; Mitochondrion; Nucleus; Vacuole No energy (ATP) required Visking tubing Controlling the water/salt balance within an organism Osmosis Water movement between cells or from soil to root Diffusion; Osmosis; Active transport Oxygen; Glucose; Water; Amino acids; Phosphate; Iron Water; Sugar; Sap; Salt(s); Protein FALSE TRUE Pressure of cell contents on cell wall Wilting Lower water concentration; Higher solute concentration Root hairs Xylem

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28 Q. Name a substance found in a plant cell vacuole.
Active transport Movement of molecules against a concentration gradient using energy Substances can be allowed or prevented in or out Allowing some substances to pass through Movement of molecules from area of high concentration to area of lower concentration Support Bacteria lose water by osmosis, this leads to inactivity or death Movement of water along a concentration gradient through a selectively permeable membrane Vacuole; Cell wall; Cell sap Chloroplast; Mitochondrion; Nucleus; Vacuole No energy (ATP) required Visking tubing Controlling the water/salt balance within an organism Osmosis Water movement between cells or from soil to root Diffusion; Osmosis; Active transport Oxygen; Glucose; Water; Amino acids; Phosphate; Iron Water; Sugar; Sap; Salt(s); Protein FALSE TRUE Pressure of cell contents on cell wall Wilting Lower water concentration; Higher solute concentration Root hairs Xylem

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30 Q. Give a feature of a plant cell that allows it to remain turgid for long periods.
Active transport Movement of molecules against a concentration gradient using energy Substances can be allowed or prevented in or out Allowing some substances to pass through Movement of molecules from area of high concentration to area of lower concentration Support Bacteria lose water by osmosis, this leads to inactivity or death Movement of water along a concentration gradient through a selectively permeable membrane Vacuole; Cell wall; Cell sap Chloroplast; Mitochondrion; Nucleus; Vacuole No energy (ATP) required Visking tubing Controlling the water/salt balance within an organism Osmosis Water movement between cells or from soil to root Diffusion; Osmosis; Active transport Oxygen; Glucose; Water; Amino acids; Phosphate; Iron Water; Sugar; Sap; Salt(s); Protein FALSE TRUE Pressure of cell contents on cell wall Wilting Lower water concentration; Higher solute concentration Root hairs Xylem

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32 Q. True or False. Plant cell walls are fully permeable.
Active transport Movement of molecules against a concentration gradient using energy Substances can be allowed or prevented in or out Allowing some substances to pass through Movement of molecules from area of high concentration to area of lower concentration Support Bacteria lose water by osmosis, this leads to inactivity or death Movement of water along a concentration gradient through a selectively permeable membrane Vacuole; Cell wall; Cell sap Chloroplast; Mitochondrion; Nucleus; Vacuole No energy (ATP) required Visking tubing Controlling the water/salt balance within an organism Osmosis Water movement between cells or from soil to root Diffusion; Osmosis; Active transport Oxygen; Glucose; Water; Amino acids; Phosphate; Iron Water; Sugar; Sap; Salt(s); Protein FALSE TRUE Pressure of cell contents on cell wall Wilting Lower water concentration; Higher solute concentration Root hairs Xylem

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34 Q. Water for photosynthesis enters the roots of plants by what process?
Active transport Movement of molecules against a concentration gradient using energy Substances can be allowed or prevented in or out Allowing some substances to pass through Movement of molecules from area of high concentration to area of lower concentration Support Bacteria lose water by osmosis, this leads to inactivity or death Movement of water along a concentration gradient through a selectively permeable membrane Vacuole; Cell wall; Cell sap Chloroplast; Mitochondrion; Nucleus; Vacuole No energy (ATP) required Visking tubing Controlling the water/salt balance within an organism Osmosis Water movement between cells or from soil to root Diffusion; Osmosis; Active transport Oxygen; Glucose; Water; Amino acids; Phosphate; Iron Water; Sugar; Sap; Salt(s); Protein FALSE TRUE Pressure of cell contents on cell wall Wilting Lower water concentration; Higher solute concentration Root hairs Xylem

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36 Q. Suggest a way in which turgor is of value to plants.
Active transport Movement of molecules against a concentration gradient using energy Substances can be allowed or prevented in or out Allowing some substances to pass through Movement of molecules from area of high concentration to area of lower concentration Support Bacteria lose water by osmosis, this leads to inactivity or death Movement of water along a concentration gradient through a selectively permeable membrane Vacuole; Cell wall; Cell sap Chloroplast; Mitochondrion; Nucleus; Vacuole No energy (ATP) required Visking tubing Controlling the water/salt balance within an organism Osmosis Water movement between cells or from soil to root Diffusion; Osmosis; Active transport Oxygen; Glucose; Water; Amino acids; Phosphate; Iron Water; Sugar; Sap; Salt(s); Protein FALSE TRUE Pressure of cell contents on cell wall Wilting Lower water concentration; Higher solute concentration Root hairs Xylem

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38 Q. Name the terms used in biology to describe the movement of substances through cell membranes.
Active transport Movement of molecules against a concentration gradient using energy Substances can be allowed or prevented in or out Allowing some substances to pass through Movement of molecules from area of high concentration to area of lower concentration Support Bacteria lose water by osmosis, this leads to inactivity or death Movement of water along a concentration gradient through a selectively permeable membrane Vacuole; Cell wall; Cell sap Chloroplast; Mitochondrion; Nucleus; Vacuole No energy (ATP) required Visking tubing Controlling the water/salt balance within an organism Osmosis Water movement between cells or from soil to root Diffusion; Osmosis; Active transport Oxygen; Glucose; Water; Amino acids; Phosphate; Iron Water; Sugar; Sap; Salt(s); Protein FALSE TRUE Pressure of cell contents on cell wall Wilting Lower water concentration; Higher solute concentration Root hairs Xylem

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40 Q. What process is responsible for the uptake of minerals in a plant?
Active transport Movement of molecules against a concentration gradient using energy Substances can be allowed or prevented in or out Allowing some substances to pass through Movement of molecules from area of high concentration to area of lower concentration Support Bacteria lose water by osmosis, this leads to inactivity or death Movement of water along a concentration gradient through a selectively permeable membrane Vacuole; Cell wall; Cell sap Chloroplast; Mitochondrion; Nucleus; Vacuole No energy (ATP) required Visking tubing Controlling the water/salt balance within an organism Osmosis Water movement between cells or from soil to root Diffusion; Osmosis; Active transport Oxygen; Glucose; Water; Amino acids; Phosphate; Iron Water; Sugar; Sap; Salt(s); Protein FALSE TRUE Pressure of cell contents on cell wall Wilting Lower water concentration; Higher solute concentration Root hairs Xylem

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42 Q. What is meant by osmoregulation?
Active transport Movement of molecules against a concentration gradient using energy Substances can be allowed or prevented in or out Allowing some substances to pass through Movement of molecules from area of high concentration to area of lower concentration Support Bacteria lose water by osmosis, this leads to inactivity or death Movement of water along a concentration gradient through a selectively permeable membrane Vacuole; Cell wall; Cell sap Chloroplast; Mitochondrion; Nucleus; Vacuole No energy (ATP) required Visking tubing Controlling the water/salt balance within an organism Osmosis Water movement between cells or from soil to root Diffusion; Osmosis; Active transport Oxygen; Glucose; Water; Amino acids; Phosphate; Iron Water; Sugar; Sap; Salt(s); Protein FALSE TRUE Pressure of cell contents on cell wall Wilting Lower water concentration; Higher solute concentration Root hairs Xylem

43 Please CLICK on THIS BOX for the Next Question
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44 Q. Where precisely does water enter a plant?
Active transport Movement of molecules against a concentration gradient using energy Substances can be allowed or prevented in or out Allowing some substances to pass through Movement of molecules from area of high concentration to area of lower concentration Support Bacteria lose water by osmosis, this leads to inactivity or death Movement of water along a concentration gradient through a selectively permeable membrane Vacuole; Cell wall; Cell sap Chloroplast; Mitochondrion; Nucleus; Vacuole No energy (ATP) required Visking tubing Controlling the water/salt balance within an organism Osmosis Water movement between cells or from soil to root Diffusion; Osmosis; Active transport Oxygen; Glucose; Water; Amino acids; Phosphate; Iron Water; Sugar; Sap; Salt(s); Protein FALSE TRUE Pressure of cell contents on cell wall Wilting Lower water concentration; Higher solute concentration Root hairs Xylem

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46 Q. The drooping of the leaves of a plant resulting from loss of turgidity due to lack of water is known as … Active transport Movement of molecules against a concentration gradient using energy Substances can be allowed or prevented in or out Allowing some substances to pass through Movement of molecules from area of high concentration to area of lower concentration Support Bacteria lose water by osmosis, this leads to inactivity or death Movement of water along a concentration gradient through a selectively permeable membrane Vacuole; Cell wall; Cell sap Chloroplast; Mitochondrion; Nucleus; Vacuole No energy (ATP) required Visking tubing Controlling the water/salt balance within an organism Osmosis Water movement between cells or from soil to root Diffusion; Osmosis; Active transport Oxygen; Glucose; Water; Amino acids; Phosphate; Iron Water; Sugar; Sap; Salt(s); Protein FALSE TRUE Pressure of cell contents on cell wall Wilting Lower water concentration; Higher solute concentration Root hairs Xylem

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48 Q. In which tissue does water ascend through the plant?
Active transport Movement of molecules against a concentration gradient using energy Substances can be allowed or prevented in or out Allowing some substances to pass through Movement of molecules from area of high concentration to area of lower concentration Support Bacteria lose water by osmosis, this leads to inactivity or death Movement of water along a concentration gradient through a selectively permeable membrane Vacuole; Cell wall; Cell sap Chloroplast; Mitochondrion; Nucleus; Vacuole No energy (ATP) required Visking tubing Controlling the water/salt balance within an organism Osmosis Water movement between cells or from soil to root Diffusion; Osmosis; Active transport Oxygen; Glucose; Water; Amino acids; Phosphate; Iron Water; Sugar; Sap; Salt(s); Protein FALSE TRUE Pressure of cell contents on cell wall Wilting Lower water concentration; Higher solute concentration Root hairs Xylem

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