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Functions/ Membrane

The Many Functions of Membrane Proteins

QuestionAnswer
Selectively Permeable Membrane A cellular membrane that allows some substances to cross the membrane more easily than other and blocks the passage of some substances altogether.
Passive Transport Diffusion of substance across a membrane
Facilitated Diffusion The act of diffusion when transport proteins provide a pathway for certain molecules to pass.
Enzyme Activity Enzymes catalyze reactions of nearby substrates.
Cell to Cell Recognition Molecules on the surfaces of other cells are "recognized" by membrane proteins
Cell Signaling A chemical messenger binds to a membrane protein, causing it to change shape and relay the message inside the cell.
Transport of Materials Transport proteins provide channels for certain solutes.
Molecules in a fluid are constantly in... motion
Diffusion the net movement of the particles of a substance from where they are more concentrated to where they are less concentrated
Permeable Molecules can pass through the membrane wall freely
Equilibrium balance; equal rate of movement on both sides (of the molecules)
Osmosis The passive transport of water across a selectively permeable membrane.
Hypertonic A solution with a higher concentration of solute.
Hypotonic A solution with a lower concentration of solute.
Isotonic Solutions with equal concentrations of solute.
Ribosomes Proteins are constructed in a cell by these clusters of proteins and nucleic acids.
Phospholipid Bilayer Two layers of phospholipid molecules at the boundary that separates a cell's aqueous cytoplasm from the aqueous solution.
Golgi Apparatus Organelle which stores, modifies, and sends proteins and other chemicals to their next destinations.
Created by: CURRANTAN
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