3A

• Plasma Membrane


  The phospholipid bilayer and embedded proteins which separate the intracellular environment from the extracellular environment. Also known as the cell membrane
• Intracellular 


  Inside a cell
• Extracellular


  Outside a cell
• Selective Permeability


  A property of cell membrane that ensures only specific substances pass across them. Also know as semipermeable
• Phospholipid


  The main molecule of which membranes are composed. They have a phosphate head and two fatty acid tails
• Phospholipid Bilyaer


  A double layer of amphiphilic molecules that forms the primary component of cell membranes
• Phosphate Head


  The hydrophilic subunit of a phospholipid
• Fatty Acid Tail


  The Hydrophobic lipid subunit of a phospholipid
• Hydrophilic

  Having a tendency to be attracted to and dissolve in water
• Polar


  Describes a molecule with both a positive end and negative end. These tend to be hydrophilic
• Hydrophobic


  Having a tendency to repel and be insoluble in water
• Nonpolar


  Describes a molecule without a clearly positive or negative end. These tend to be hydrophobic
• Amphipathic


  Describes molecules with both hydrophilic and hydrophobic components. Also known as amphiphilic
• Protein


  A class of biomacromolecule made of amino acid monomers folded into a 3D shape, consisting of carbon, hydrogen, oxygen, nitrogen, and sometimes sulphur
• Carbohydrate


  A class of biomacromolecule made from monosaccharide monomers consisting of carbon, hydrogen, and oxygen. Also known as saccharides or sugars
• Cholesterol


  A steroid-alcohol that regulates fluidity in the plasma membrane
• Integral Protein


  A protein that is permanently secured to the plasma membrane
• Transmembrane Protein


  An integral protein that spans the entire plasma membrane
• Peripheral Protein


  A protein that is temporarily attached to the plasma membrane
• Cytoskeleton


  The microscopic web of protein filaments in the cytoplasm. It provides structure and support, and transports products around the cell
• Glycolipid


  A phospholipid bound to a carbohydrate
• Glycoprotein


  A protein bound to a carbohydrate
• Fluid Mosaic Model


  The theory of how the plasma membrane is structured
• Saturated


  A fatty acid chain with only single bonds between carbon atoms
• Unsaturated


  A fatty acid chain with at least one double or triple bond between carbon atoms