APBio 3.1-3.4

Why is ATP an important molecule in metabolism?

• Its hydrolysis provides an input of free energy for exergonic reactions.
• It provides energy coupling between exergonic and endergonic reactions.
• Its terminal phosphate group contains a strong covalent bond that when hydrolyzed releases free energy.
• Its terminal phosphate bond has higher energy than the other two.

Which macromolecules are enzymes?

• Carbohydrate

• Lipid

• Nucleic Acid

• Protein

Why does the substrate binding activate the enzyme?

• Activates accessory molecules

• Changes shape

• Provides energy

• Transport reaction

How does an enzyme speed up the chemical reaction?

• Decrease the activation energy required

• Decrease the change in free energy

• Increase the activation enzyme required

• Increase the change in free energy

Where does the substrate bind on an enzyme?

• Active site

• Enhancer

• Promoter

• TATA box

How does an enzyme affect ΔG (change in Gibbs free energy)?

• Decrease

• Increase

• No effect

How does an enzyme affect activation energy?

• Decrease

• Increase

• Stays the Same

Due to lower activation energy, how is the reaction rate affected?

• Decrease

• Increase

• Stays the Same

What does an enzyme do to reaction rate?

• Decrease

• Increase

• Stays the Same

How is the activation energy different with an enzyme?

• Decrease

• Increase

• Stays the Same