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People who are diagnosed with lactose intolerance lack sufficient amounts of the enzyme lactase which is responsible for breaking down lactose.  If lactose is not able to be broken down, it will not be able to diffuse into the blood from the intestine and as a result can create significant abdominal discomfort.  Lactose, shown below, represents which type of sugar?   

Write the molecular formula for a compound formed between Potassium ion and a Sulfide ion.  Use the periodic table below.  Potassium has the symbol K, Sulfur has the symbol S and remember to use the text editor for subscripts or superscripts as necessary.   

The is the main function of enzymes within a cell?

For a patient with Type 1 diabetes, the immune system attacks the pancreas and the person is not able to produce insulin. Based on what you know about GLUT transport proteins, briefly explain why this lack of insulin prevents glucose from entering a cell to be metabolized.

Gastric Acid, also known as stomach acid, is a very strong digestive fluid composed primarily of hydrochloric acid (HCl).  If the [H3O+] of gastric acid is 0.063 M, what is the pH of this solution?  Your answer should have 2 significant figures. 

Ammonia decomposes into nitrogen and hydrogen gases by the following equation: NH3 (l)

By the time carbohydrates have passed through the stomach and intestines, they have been broken down into single sugars such as glucose.  At the same time fats that pass through the stomach and intestines have been broken down into fatty acids.  The image below shows various examples of fatty acids.  Briefly describe why glucose can diffuse directly into the blood and fatty acids cannot.     

Detergent molecules consist of a small polar group and a long nonpolar tail.  These molecules are able to trap grease and help to wash it away because in water, they create spheres that are polar on the outside and nonpolar on the inside.  These spheres are known as

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?   

The image below shows two different fatty acid molecules.  Molecule [B] has a trans double bond.  Molecule [A] would most likely be found in nature.