Phospholipid bilayer that contains proteins.
-has numerous functions, including regulating the passage of molecules into and out of the cell.
lipid found in the animal plasma membrane.
helps modify the fluidity of the membrane. , Provides strength & structural support to membrane in Lipid Bilayer
-Found only in animal cells
-various functions including lending support to the plasma membrane and assisting communication between cells.
-Meshwork of proteins and polysaccharides in close association with the cell that produced them.
(sugars) on surface are attached to proteins and lipids in the membrane (glycoproteins, glycolipids); many function as cell identification tags
"sugar coat" of membrane.
-protects the cell
-facilitates adhesion between cels, reception of signaling molecules and cell-to-cell recognition.
The proteins involved in the passage of molecules through the membrane. They include a passage that allows a substance to simply move across the membrane.
Proteins involved in Selectively interacting with a specific molecule or ion so that it can cross the membrane.
Cell Recognition Proteins
-Proteins involved with recognition.
Proteins that have a shape that allow a specific molecule to bind in it.
A protein that catalyzes a specific chemical reaction.
-Carries out metabolic reactions directly.
-allow 2 different cells to bond to eachother
-involved in forming various types of junction between animal cells
-signaling molecules that pass through gap junctions allow the cilia of cells that line your repiratory tract to beat in unison
Meaning Certain substances can move across the membrane while others cannot.
Represents a higher concentration of molecules in one area vs a lower concentration of molecules in another.
Membrane channel protein that allows water to passively move through.
The process by which large particles and macromolecules are transported through plasma membranes. Inc. exocytosis and endocytosis
Diffusion of water across a differentially permeable membrane due to concentration differences.
Solution used in labs where cells are normally placed in solution where Solute concentration and water concentration both inside and outside the cell are equal.
Strength of the solution.
Solution that causes cells to swell due to intake of water.
-Higher Concentration of water then what's inside the cell.
-Net movement from outside to inside.
Solution that may cause cells to shrink or shrivel.
-Solution with higher percentage of solute (lower co concentration of water) then the cell.
-Net movement from inside to outside, water leaves the cell.
the pressure that is exerted on the inside of cell walls and that is caused by the movement of water into the cell.
-Very important to plant cells to maintain strength.
Shrinking of cell's cytoplasm due to osmosis.
is the movement of a molecule from an area of high concentration to an area of lower concentration (diffusion), with the aid of a protein channel or carrier.
energy-requiring process that moves material across a cell membrane against a concentration difference
A name given to Proteins involved in active transport.
process of exporting proteins from a cell by a vesicle fusing with the plasma membrane and spilling the proteins outside the cell
(contents leave cell)
Process of cells taking in substances by vesicle formation. A portion of the plasma membrane invaginates to envelop the substances, and then the membrane pinches off to form an intracellular membrane.
(cell takes in contents)
- processes of Endocytosis
process in which extensions of cytoplasm surround and engulf large particles and take them into the cell
-Process of Endocytosis
-Process in which vesicles form around a liquid or around very small particles.
-Form of Pinocytosis
Quite specific, uses a receptor protein shaped in such a way that a specific molecule such as a vitamin, peptide hormone, or lipoprotein can bind to it.
-Far more selective then Pinocytosis.
-Involved in uptake and transfer and exchange of substances between cells.
Serve to mechanically attach adjacent cells.
Internal Cytoplasmic Plaques
-attached to cytoskeleton within each cell
-Type of Adhesion Junction
-Internal Cytoplasmic plaques, firmly attached to cytoskeleton within each cell, are joined by intercellular filaments
-Results in sturdy, flexible sheets of cells.
-Stretchable tissues of cells held together by These.
-Plasma membrane proteins attach to each other, producing a zipperlike fastening.
-Between Adjacent cells
Junction in which Allows cells to communicate.
-Formed when two identical plasma membrane channels join.
-Channel of each cell is lined by six plasma membrane proteins
-Permits small molecules and ions to pass between them.
Connects the cytoplasm of living plant cells.
numerous, narrow, membrane-lined channels that pass through the cell wall.