32. What are the functions of the plasma membrane? To maintain homeostasis by regulating what enters and leaves the cell and acts as a boundary providing a barrier between cell and its environment 33. The plasma membrane is semi-permeable. What does this mean? It is selective as to what it lets in and out of the cell. Only certain things can come in and out. 34. Label the following plasma membrane: phospholipid bilayer with polar heads and fatty acid tails and embedded proteins 35. What is a concentration gradient? Difference in concentration values – concentration on one side of the membrane is higher than on the other side. 36. Fill in the following chart: Types of Transport Direction Is ATP required? Is equilibrium reached? Active Transport Movement from low to Yes energy required No equilibrium not high concentration reached. Passive Transport Movement from high to No energy required Yes equilibrium low concentration reached. 37. Fill in the following chart: Types of Passive Transport Direction Is ATP What is being Is a membrane required? transported? protein needed? Diffusion Movement from No. Solutes – particles No. high to low such as salt, concentration. sugars, etc. Osmosis Movement from No. Water No. high to low concentration. Facilitated Movement from No. Solutes – particles Yes. Diffusion high to low such as salt, concentration. sugars, etc. 38. Fill in the following chart : Osmotic Pressure (Osmosis) Location of Location of Direction of Change in cell Higher conc. of Higher conc. of water size solutes water movement HypOtonic Higher conc. of Higher conc. Of Water moves into Cell swells or gets solutes inside of water outside cell cell bigger cell Hypertonic Higher conc. Of Higher conc. Of Water moves Cell shrinks or solutes outside of water inside cell outside cell gets smaller
32. What are the functions of the plasma membrane? To maintain homeostasis by regulating what enters and leaves the cell and acts as a boundary providing a barrier between cell and its environment 33. The plasma membrane is semi-permeable. What does this mean? It is selective as to what it lets in and out of the cell. Only certain things can come in and out. 34. Label the following plasma membrane: phospholipid bilayer with polar heads and fatty acid tails and embedded proteins 35. What is a concentration gradient? Difference in concentration values – concentration on one side of the membrane is higher than on the other side. 36. Fill in the following chart: Types of Transport Direction Is ATP required? Is equilibrium reached? Active Transport Movement from low to high concentration Yes energy required No equilibrium not reached. Passive Transport Movement from high to low concentration No energy required Yes equilibrium reached. 37. Fill in the following chart: Types of Passive Transport Direction Is ATP required? What is being transported? Is a membrane protein needed? Diffusion Movement from high to low concentration. No. Solutes – particles such as salt, sugars, etc. No. Osmosis Movement from high to low concentration. No. Water No. Facilitated Diffusion Movement from high to low concentration. No. Solutes – particles such as salt, sugars, etc. Yes. 38. Fill in the following chart : Osmotic Pressure (Osmosis) Location of Higher conc. of solutes Location of Higher conc. of water Direction of water movement Change in cell size HypOtonic Higher conc. of solutes inside of cell Higher conc. Of water outside cell Water moves into cell Cell swells or gets bigger Hypertonic Higher conc. Of solutes outside of Higher conc. Of water inside cell Water moves outside cell Cell shrinks or gets smaller