Front

What most likely happens to pepsin as it enters the small intestine?

Back

It becomes inactive.

Front

In living cells, enzymes act as catalysts, which may reduce the amount of activation energy required for a chemical reaction to occur. In the graphs below, pathway x is a solid line representing the uncatalyzed reaction. The dotted line shows the catalyzed reaction. Which graph best illustrates the changes in a reaction when the catalyst reduces the amount of energy required?

Back

Front

What type of molecule is formed from amino acids?

Back

proteins

Front

Classify the compound made up of carbon, hydrogen, and oxygen in a ratio of two hydrogen atoms for each carbon atom.

Back

carbohydrate

Front

Fats, oils and cholesterol are all types of what?

Back

lipids

Front

RNA and DNA are which type of macromolecules?

Back

nucleic acid

Front

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

Back

The reaction rate will increase.

Front

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

Back

nucleic acids

Front

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?

• Enzymes function best at a specific temperature.
• The body needs to be warm to prevent hypothermia.
• The body is kept relatively warm to prevent too much enzyme action.
• There is no connection between the two statements.

Back

Enzymes function best at a specific temperature.

Front

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

monosaccharides

,

nucleic acids

,

amino acids

,

phospholipids

Back

monosaccharides