Explanation
Substances that compete to attach to an enzyme’s active site are called inhibitors. If they attach to the enzyme first, the cellular reaction (in this case the synthesis of prostaglandins) will not take place. A hormone is a specific chemical messenger used throughout the endocrine system. The COX-2 inhibitor is a molecule, not an ion. Prosthetic groups and cofactors are substances that work with enzymes to enhance certain reactions, whereas an inhibitor will limit the reaction.
Battery companies make impressive claims about how long their batteries will last. A student decided to test the running time of different batteries to determine which battery lasts the longest. The student tested 6 different batteries, 4 brand name and 2 generic, using flashlights. The results show that the battery referred to as Name Brand A lasted the longest, with 101 hours of runtime:
Flashlight | Battery | Runtime in hours |
Gearlight Super Light | Name Brand A | 101 |
SureFire | Name Brand B | 99 |
Maglight | Name Brand C | 80 |
Bright Star | Name Brand D | 75 |
SureFire | Generic A | 30 |
Bright Star | Generic B | 29 |
It could be argued that this experiment was not set up using proper experimental protocol. What would need to change in the experiment for the results to be valid?