Blog

The following molecule is the active ingredient in dark chocolate, known as theobromine and more commonly cocoa.  Which of the following atoms in this molecule is making an incorrect number of bonds?   

In the correct order, the products of Glycolysis, the Citric Acid Cycle and the Electron Transport Chain are:

Compare the atoms Potassium (K) and Bromine (Cl) help to balance charges across membranes in the cell.  For K, the ionization energy is [IA] and the electron affinity is [EA] compared to Cl.   

The three most common forms of chocolate in the United States are Dark Chocolate, Milk Chocolate and White Chocolate.  The following image shows the active ingredients in each of these types of chocolate.  Which of these active ingredients represents the nonpolar molecule?    

Match each molecule to its correct organic family. A. CH3CH2CH2CH2CH3 B. CH3CH2OH C. CH3NH2 D. CH3CH2SH

Carbon tetrachloride, CCl4, used to be a primary component in fire extinguishers but was phased out due to toxicity upon prolonged exposure.  The chlorine atoms in the CCl4 molecule form [bonds] bonds with the carbon and each chlorine has [LP] lone pairs of electrons.  The overall molecule has a [shape] geometry.

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?