For each of the following sentences, fill in the blanks with the best word or phrase selected from the list below.Not all words or phrases will be used; each word or phrase should be used only once.

\begin{array}{lll}\text { active } & \text { hydrophilic } & \text { noncovalent } \\\text { amino acid } & \text { hydrophobic } & \text { passive } \\\text { amphipathic } & \text { ion channels } & \text { transporter proteins }\end{array}

A molecule moves down its concentration gradient by __________ transport, but requires __________ transport to move up its concentration gradient.Transporter proteins and ion channels function in membrane transport by providing a __________ pathway through the membrane for specific polar solutes or inorganic ions.__________ are highly selective in the solutes they transport, binding the solute at a specific site and changing conformation so as to transport the solute across the membrane.On the other hand, __________ discriminate between solutes mainly on the basis of size and electrical charge.

Describe the Process by Which Gut Epithelial Cells Use Transporters

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