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Transcript
Name_______________________ Phospholipids and membrane structure The cell membrane is made mostly of molecules called phospholipids. Draw a diagram of a phospholipid. Label the “head” and “tails” and include their properties. Draw a diagram of a membrane made only of phospholipids. Show how the properties of the phospholipids cause them to form a bilayer structure. Movement of molecules through a membrane made only of phospholipids Analyze the information in the PowerPoint table to answer the questions below. Simple diffusion is when molecules pass directly between the phospholipids of a lipid bilayer. Which molecules can pass through the membrane by simple diffusion? Using specific examples from the table in the PowerPoint, describe how a cell membrane is a semi-permeable membrane. Describe what properties allow a molecule to pass through a phospholipid membrane and what properties prevent a molecule from passing through a phospholipid membrane. Think about it… According to the information in the table, glucose is not able to cross a cell membrane directly between phospholipid molecules. But cells need glucose for energy! What types of structures do you think the cell membrane could have to allow glucose to cross the membrane? Types of Cellular Transport Simple diffusion: Passive or active? Drawing Require energy (ATP)? Direction of transport Require carrier protein? Example of molecule that moves into or out of the cell by simple diffusion: Facilitated diffusion: Passive or active? Drawing Require energy (ATP)? Direction of transport Require carrier protein? Example of molecule that moves into or out of the cell by facilitated diffusion: Active transport: Passive or active? Require energy (ATP)? Direction of transport Require carrier protein? Example of molecule that moves into or out of the cell by active transport: Drawing