As food travels through the digestive system, it is exposed to a variety of pH levels. The stomach has a pH of 2 due to the presence of hydrochloride acid (HCl), and the small intestine has a pH ranging from 7 to 9. HCl converts pepsinogen into pepsin, an enzyme that digests proteins in the stomach. Which of the following most likely happens to pepsin as it enters the small intestine?

You are analyzing a compound in the laboratory. You find that it is made up of carbon, hydrogen, and oxygen in a ratio of two hydrogen atoms for each carbon atom. How will you classify the compound?

Fats, oils, and cholesterol are all types of what?

RNA and DNA are which type of macromolecules?

What will most likely happen if an appropriate enzyme is added to a chemical reaction?

A sugar, a phosphate group, and a nitrogen base form the building blocks of which organic compound?

The human body maintains a temperature of around 98.6 degrees at all times. Enzymes are involved in almost every chemical reaction in the body. Which of the following describes the connection between these two statements?

The enzyme lactase will break down the sugar lactose into which of the following components?