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The enzyme HIV protease is responsible for activating proteins expressed by the Human Immunodifficiency Virus (HIV) which then attack the host immune system.  This protein has been the target of highly successful drug development in order to block HIV activity.  The image below shows a close-up of the active site of HIV protease bound to one of these drugs, showing specific intermolecular interactions.  The atoms making the interactions are labeled.  Match each interaction to its correct type.    

Below is an image of a cellular membrane.  Which part of the membrane is polar and which part is nonpolar?   

The chemical formula for sodium phosphate is Na3PO4.  What is the charge on the phosphate ion?

Which term best describes the relatively small portion of the enzyme that is directly involved in the biochemical reaction being catalyzed?

Which of the following molecules represents an aldehyde? A.      B.        C.      D.     

What mass (in grams) of ethanol can fill a 200.0 mL beaker if the density of ethanol is 0.789 g/mL?  

Draw a Lewis structure for the molecule N2.  The bond between the nitrogen atoms is best described as a _________________ bond.   

Name the following molecule: CH3CH2CH2OH

The reactant in an enzyme-catalyzed reaction is the

What is the atomic mass of the ion in the previous question if it has 11 protons, 10 electrons and 13 neutrons?