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Vesicle Trafficking - Vesicle Trafficking Vesicles may...

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Vesicle Trafficking Vesicles may follow microtubules to their destination. Proteins within the membrane of the vesicle recognize and attach to proteins in other membranes. This allows vesicles to attach to the membranes of other organelles such as the endoplasmic reticulum, golgi apparatus, or lysosomes. Transport of Materials Across Cell Membranes Facilitated Diffusion Facilitated diffusion involves the use of a protein to facilitate the movement of molecules across the membrane. In some cases, molecules pass through channels within the protein. In other cases, the protein changes shape, allowing molecules to pass through. As can be seen below, the protein changes shape and releases the molecule to the side of the membrane that has the lower concentration.
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Additional energy is not required because the molecule is traveling down a concentration gradient (high concentration to low concentration). The energy of movement comes from the concentration gradient.
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