Ch 2: Fuel for Exercise

What are substrates in the context of bioenergetics?

• Waste products of metabolism

• Fuel sources for energy production

• Enzymes that catalyze reactions

• Hormones regulating body functions

What is the total amount of energy available from body stores of fuels in kilocalories?

• 74,833

• 7,961

• 73,320

• 1,513

What is one function of enzymes in chemical reactions?

• Increase the activation energy

• Lower the activation energy

• Neutralize the reaction

• Stop the reaction

What do enzymes NOT do in a chemical reaction?

• Start the reaction

• Facilitate breakdown

• Lower activation energy

• End with -ase

What influences the activity of a rate-limiting enzyme?

• Positive feedback

• Negative feedback

• Neutral feedback

• No feedback

What is the result of ATP breakdown besides energy?

• Glucose

• ADP and Pi

• Oxygen

• Carbon dioxide

What is the significance of ATP being a high-energy phosphate?

• It stores genetic information

• It provides a quick energy source

• It transports nutrients

• It builds cell walls

What is the main function of ATPase in the cell?

• To synthesize proteins

• To break down ATP

• To transport oxygen

• To store energy

Which ATP synthesis pathway involves oxidative phosphorylation?

• ATP-PCr system

• Glycolytic system

• Oxidative system

• Photosynthetic system

What is a catabolic reaction?

• A reaction that requires an input of energy

• A reaction that forms complex molecules from simple building blocks

• A reaction that releases energy

• A reaction that breaks down complex molecules into their components