Question Answer
What are cell membranes composed of? Cell Membranes are composed of two phospholipid layers.
What does the cell membrane do? The cell membrane, or the plasma membrane, forms a boundary between a cell and the outside environment and controls the passage of materials into and out of a cell.
What is a phospholipid? A phospholipid is a molecule composed of a charged phosphate group, glycerol, and two fatty acid chains.
What is in the phospholipid layers? The cell membrane is made of two phospholipid layers embedded with other molecules, such as proteins, carbohydrates, and cholesterol.
What is selective permeability? The cell membrane has the property of selective permeability, which means it allows some, but not all, materials to cross.
What is a receptor? A receptor is a protein that detects a signal molecule and performs an action in response.
What does intracellular mean? Intracellular means "within, or inside a cell"
What is passive transport? Passive transport is the movement of molecules across a cell membrane without energy input from the cell.
What is diffusion? Diffusion is the movement of molecules in a fluid or gas from a region of higher concentration to a region of lower concentration.
What is a concentration gradient? A concentration gradient is the difference in the concentration of a substance from one location to another.
What is osmosis? Osmosis is the diffusion of water or another solvent from a more dilute solution to a more concentrated solution through a membrane that is permeable to the solvent
What is an isotonic solution? An isotonic solution is a solution that has an equal concentration of dissolved particles compared with another solution.
What is a hypertonic solution? A hypertonic solution is a solution that has a solute concentration higher than the solute concentration inside a cell.
What is a hypotonic solution? A hypotonic solution is a solution that has a solute concentration lower than the solute concentration inside a cell.
What is facilitated diffusion? Facilitated diffusion is the diffusion of molecules across a membrane through transport proteins.
What does the word "facilitate" mean? The word "facilitate" means "to make easier"

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