How many times can an enzyme work on a reaction?

What would happen if the tubing with the yellow band was placed in a beaker of distilled water?

The greenhouse effect a. something that has occurred for millions of years b. an unnatural phenomenon caused by humans that maintains earths temperature range. c. the results of the differences in the angle of the suns rays d. an unnatural phenomenon that causes heat energy to be radiated back into the atmosphere

In what cells is the human genome located?