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Cell Membranes

Module by: Rudy Lopes

Summary: The cell membrane is a selectively permeable membrane made up of a lipid bilayer and proteins surrounding the cell. Use these tutorials to learn more about cell membranes, their structure, and their function in plant and animal cells.

Active Transport -- Active transport is the mediated process of moving molecules and other substances across membranes. Use this tutorial to learn about active transport, including such key terms as adenosine triphosphate (ATP), carrier mediated transport, and concentration gradients.

Passive Transport -- Passive transport is the cellular process of moving molecules and other substances across membranes. Learn about diffusion, facilitated diffusion, filtration, and osmosis in this Passive Transport tutorial.

Carrier Proteins -- Carrier proteins help specific molecules or ions pass through the plasma membrane. Do you know how carrier proteins work? This interactive tutorial will help you to absorb this key concept.

Membrane Proteins -- How much do you know about the three types of membrane proteins? Find out about integral proteins, transmembrane proteins, and peripheral proteins with this interactive tutorial.

Lipid Bilayer -- The lipid bilayer is an organic compound that is insoluble in water but soluble in nonpolar solvents, providing the basic impermeable structure of the membrane. Explore the process, structure, and function of an plasma membrane's lipid bilayer with this interactive tutorial.

Endocytosis -- Endocytosis is a cellular process where cells absorb molecules or substances from outside the cell by engulfing it with the cell membrane. This tutorial explains the cellular processes involved in endocytosis, including phagocytosis, pinocytosis, and receptor-mediated endocytosis.

Exocytosis -- Exocytosis is the cellular process by which cells excrete waste products or chemical transmitters. Learn about this process in this tutorial.

Diffusion Through a Membrane -- Diffusion is the net movement of particles (atoms, molecules, or ions) from a highly concentratd region to a region of low concentration. Understanding diffusion through a membrane is a key biology concept. Take this interactive tour to help you master the process and terminology.

Osmosis in an Animal Cell -- In biological terms, osmosis is the diffusion of water though a membrane to a region with a lower concentration of water. Do you understand how osmosis works in an animal cell? Take this interactive tour to help you master the concept and terminology.

Osmosis in a Plant Cell -- In biological terms, osmosis is the diffusion of water though a membrane to a region with a lower concentration of water. Do you understand how osmosis works in a plant cell? Take this interactive tour to help you master the concept and terminology.

Plasma Membrane - Animal Cell -- The plasma membrane is a selectively permeable membrane made up of a lipid bilayer and proteins surrounding the cell. Explore the process, structure, and function of an animal cell's plasma membrane with this interactive tutorial.

Plasma Membrane - Plant Cells -- The plasma membrane is a selectively permeable membrane made up of a lipid bilayer and proteins surrounding the cell but inside the cell wall. Explore the process, structure, and function of a plant cell's plasma membrane with this interactive tutorial.

My Cell Membranes -- Use these flash cards to practice your grasp of endocytosis, exocytosis, turgor pressure, and dozens of other biology terms.

Biology Quiz: Cell Membranes -- Think you know all about cell membranes? Use this self-quiz to make sure you remember active transport, plasma membranes, lipid bilayer, and more.

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