Learn about the purpose of the cell membrane. Explore the parts of a cell membrane to understand how the cell membrane's structure is made and discover its function.

Simple diffusion is the process by which molecules, atoms, or ions diffuse through a semipermeable membrane down their concentration gradient without the assistance of transporter proteins.

Active transport is the energy-requiring transport of substances across a plasma membrane against the concentration gradient, i.e. from low concentration to high concentration.

Nuclear pores are found in the nuclear membrane. See Figures 2 and 3 for an illustration of the location of the nucleus and nuclear pores in a plant cell (Figure 2) and in an animal cell (Figure 3).

Discover what channel proteins are. Learn about the channel protein's function, examples of channel proteins, carrier proteins, and facilitated...

The cell membrane is a thin flexible barrier that surrounds all cells. The cell membrane is made of a phospholipid bilayer. It protects the cell and regulates what enters and leaves.

Transport proteins move molecules that are unable to move using simple diffusion across a membrane. There are two main types of transport proteins: carrier proteins and channel proteins.

The outside of the thylakoid is called the membrane, which is a thin covering that keeps harmful things out while allowing necessary things, like nutrients, in. Thylakoid membranes act as the ...

Learn the intracellular definition and understand how intracellular structures are made up. Study different types of intracellular organelles and their functions.

In this lesson, understand the function and location of the mitochondrial matrix. See a mitochondria diagram and learn what makes up the mitochondria.