Cells Rapid Review for AP Biology
For a more thorough review of the terminologies below, please refer to the following concepts:
- Types of Cells and Organelles for AP Biology
- Cell Membranes and Types of Cell Transport for AP Biology
Fluid mosaic model: plasma membrane is a selectively permeable phospholipid bilayer with proteins of various lengths and sizes interspersed with cholesterol among the phospholipids.
Integral proteins: proteins implanted within lipid bilayer of plasma membrane.
Peripheral proteins: proteins attached to exterior of membrane.
Diffusion: passive movement of molecules down their concentration gradient (from high to low concentrations).
Osmosis: passive movement of water from low solute to high solute (hypotonic to hypertonic).
Facilitated diffusion: assisted transport of particles across membrane (no energy input needed).
Active transport: movement of molecules against concentration gradient (low to high concentrations; requires energy input).
Endocytosis: phagocytosis of particles into a cell through the use of vesicles.
Exocytosis: process by which particles are ejected from the cell, similar to movement in a trash chute.
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