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. Continue reading

My Cell Membranes

Use these flash cards to practice your grasp of endocytosis, exocytosis, turgor pressure, and dozens of other biology terms. Continue reading

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. Continue reading

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. Continue reading

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. Continue reading

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. Continue reading

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. Continue reading

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. Continue reading

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. Continue reading