During nerve cell signaling, a change in membrane potential will cause sodium channels to open and let Na+ ions diffuse down their concentration gradient into the cell. Which of the following helps establish the concentration gradient necessary for this process to occur?

You are studying an enzyme-catalyzed reaction that induces a particular cellular activity in the lab.  If you wanted to slow down that cellular activity by controlling the enzyme, what could you do?  

Macrophages, a type of white blood cell, are able to remove bacteria from our bodies by

The component of the cytoskeleton that forms a web just under the plasma membrane, functions in the amoeboid movement of pseudopods, is responsible for muscle contractions, and allows white blood cells to crawl after and eat bacteria are 

Kidney dialysis relies on diffusion to move various small waste molecules (solutes), out of the blood, across a semipermeable dialysis membrane. If the concentration of solutes in the blood increases before dialysis is administered, what will happen to the rate of dialysis when it occurs?

A bag made from dialysis tubing is filled with a 20% starch solution. Starch is too large to pass through the holes. The dialysis bag is placed in a beaker of distilled water.  What will happen?

The function of an enzyme is to 

If you were a very thirsty cell, which process would you use to take in some nutrient liquid secreted by one of your neighbors?

The maximum size of a cell is limited by

Which is a correct association of membrane protein types?