1)What is the difference between simple and facilitated diffusion across cell membranes? Which three physiologically important small molecules are able to diffuse across cell membranes by simple diffusion?  2)The energy provided for an ion pump (active transport) such as the Na/K-ATPase to build an ion gradient comes from what source? Would the mechanism of ion movement across this pump be an exergonic or endergonic process? Explain

1)What is the difference between simple and facilitated diffusion across cell membranes? Which three physiologically important small molecules are able to diffuse across cell membranes by simple diffusion? 

2)The energy provided for an ion pump (active transport) such as the Na/K-ATPase to build an ion gradient comes from what source? Would the mechanism of ion movement across this pump be an exergonic or endergonic process? Explain.

3)Explain what makes the glucose uniporter a passive transporter, but the sodium glucose cotransporter an active transporter. 

4)What makes a solution hypotonic? 

5)A hyperosmotic solution may not be hypertonic. How could you test if this statement is true?