migration
Trade.
Diffusion.
Facilitated diffusion occurs when a substance is aided across a membrane by a special molecule called an ionophore. Ionophores allow some molecules to diffuse but not others, effectively speeding up the rate of diffusion of that molecule.
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Computer Aided Design or Drafting (Draughting in the UK)
Simple answer: Diffusion There are multiple methods: simple diffusion is where smaller molecules are able to pass into the cell based on the concentration of the substance on one side of the cell. Facilitated diffusion also relies on concentration but is aided through non-energy using processes, such as channels that are the correct physical shape and charge to draw in a molecule. Finally there is active diffusion, which requires an input of energy and usually works against a concentration barrier. Diffusion involving only the movement of water is known as osmosis.
CAD Stands for computer-aided design and drafting.
Proteins embedded in cell membranes, called receptor proteins, help aid in cell recognition by binding to specific molecules. These proteins assist in cell communication and signaling, allowing cells to recognize and respond to each other. Diffusion is aided by a concentration gradient, temperature, and the size and charge of the molecules involved.
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