Transport proteins are integral membrane proteins involved in moving ions, small molecules, or macromolecules, such as another protein, across a biological membrane.
Active Transport: This is a process that moves ions or molecules across a cell membrane into a region of higher concentration, assisted by enzymes and requiring energy.
Passive Transport: This is a movement of ions and other atomic or molecular substances across cell membranes without need of energy input.
Channel Proteins: These are special type of transport proteins that form small openings, or channels, in the cell membrane allowing specific molecules or ions to pass through.
AP Biology - 2.4 Plasma Membranes
AP Biology - 2.7 Facilitated Diffusion
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