Biology Quiz: Enzymes and Bioenergetics

What are the most common biological catalysts?

• Lipids

• Proteins

• Nucleic acids

• Carbohydrates

What is the ultimate source of energy for most organisms?

• Nuclear energy

• Solar energy

• Chemical energy

• Geothermal energy

What is the first law of thermodynamics also known as?

• Law of conservation of matter

• Law of conservation of energy

• Law of entropy

• Law of motion

What is the change in free energy formula?

• ΔG = ΔH * TΔS

• ΔG = ΔH / TΔS

• ΔG = ΔH - TΔS

• ΔG = ΔH + TΔS

What is the role of ATP in coupled reactions?

• It increases the activation energy

• It provides energy for endergonic reactions

• It decreases the rate of catalysis

• It stabilizes the transition state

What is the function of an enzyme's active site?

• To change the shape of the substrate

• To stabilize the transition state

• To bind to the substrate

• To expose the reactant molecules to altered charge environments

What is the effect of competitive inhibition on enzyme activity?

• It reduces the ability of the active site to bind substrate

• It slows or stops the reaction

• It has no effect on the enzyme activity

• It increases the enzyme activity

What is the effect of noncompetitive inhibition on enzyme activity?

• It increases the enzyme activity

• It has no effect on the enzyme activity

• It slows or stops the reaction

• It reduces the ability of the active site to bind substrate

What is the effect of changes in temperature and pH on enzyme activity?

• They have no effect on enzyme activity

• They increase enzyme activity

• They decrease enzyme activity

• They can have a significant effect on enzyme activity

What is the role of cofactors and coenzymes in enzyme activity?

• They have no role in enzyme activity

• They increase enzyme activity

• They decrease enzyme activity

• They are nonsubstrate molecules that bind to an enzyme and decrease its activity