Question

the channel proteins movement is dramatic, and allows cl - ions to begin flowing passively across the membrane down their concentration gradient—from an area of high concentration to an area of low concentration. but heres the thing. in this case (and some others, as it turns out), atps role is only regulatory. it makes the protein move, like a light switch that turns cftr on (open) or off (closed). the actual flow of cl - ions through the channel, though, does not require energy. they flow passively following their gradient. regulation is active but transport is passive. which of the following general themes in the life sciences are illustrated by ion channels? the structure of molecules correlates with their function. when one molecule binds to another, in many or most cases something important happens. membranes with long, saturated phospholipids are less flexible and less permeable than membranes with shorter, unsaturated phospholipids. as a result of their structural diversity, proteins serve a wide array of functions in cells.

Explanation:

Ion channels are proteins. Their specific structure allows them to regulate the flow of ions across the membrane. When ATP (a molecule) binds to the ion - channel protein (CFTR in this case), it acts like a light - switch to turn the channel on or off, which is an important event. Also, the structural diversity of proteins (ion channels being a type of protein) is shown as they have the function of ion transport. The structure of the ion - channel molecule clearly correlates with its function of ion transport. The statement about membrane phospholipids is not directly related to ion channels in this context.

Answer:

The structure of molecules correlates with their function.
When one molecule binds to another, in many or most cases something important happens.
As a result of their structural diversity, proteins serve a wide array of functions in cells.