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* The proteins have a maximal rate.  If the concentration of the molecule to be transported is very high the number of proteins is likely to limit the rate.
 
* The proteins have a maximal rate.  If the concentration of the molecule to be transported is very high the number of proteins is likely to limit the rate.
 
* Some of the proteins bind a small number of differant molecules.  These molecules will compete for the proteins and will be transported in similar relative quantites to their original concentrations.
 
* Some of the proteins bind a small number of differant molecules.  These molecules will compete for the proteins and will be transported in similar relative quantites to their original concentrations.
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==Transport Proteins and Active Transport==
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Transport proteins can take part in facilitated diffusion which is a passive process or they can be involved in [[Active Transport - Physiology| Active Transport]]
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