Energy Flow - Test #1 - Enzymes & ATP

Which phrase best describes an exothermic chemical reaction?

• Does not absorb any energy.
• Forms products with higher bond energy than reactants.
• Is in a state of equilibrium.
• Releases more energy than it absorbs.

Identify the products in this reaction: 6H2O + 6CO2 🡪 C6H12O6 + 6O2

• 6H2O and 6CO2
• 6CO2 and C6H12O6
• 6H2O, C6H12O6, and 6O2
• C6H12O6 and 6O2

Chemical reactions that absorb more energy than they release are considered to be _____.

• exothermic
• catalyzed
• endothermic
• anabolic

The activation energy needed for a chemical reaction is decreased by the presence of a _____.

• catalyst
• reactant
• product
• substrate

In the enzyme-substrate complex pictured below, what is happening during the second picture?

• The catalyzed reaction is releasing a product.
• The enzyme is breaking bonds in the substrate.
• The enzyme is keeping the bonds the same in the substrate.
• The substrate is beginning to bind to the enzyme.

If the activation energy of a biochemical reaction is lowered, then

• The reaction will happen faster.
• The reaction will happen more slowly.
• More energy will need to be absorbed.
• The rate of the reaction will be unaffected.

The molecule that an enzyme binds to is known as its _____.

• substrate
• monomer
• polymer
• complementary base

Reactants bind to enzymes at the _____.

• substrate
• product
• activation energy
• active site

In the graph below, an increase in temperature results in

• a decrease in the required activation energy.
• an increase in reaction rate.
• a decrease in the rate of reaction.
• an increase in both the reaction rate and activation energy.

What factors affect the rate of chemical reactions? (check all that apply)

• temperature
• pH
• substrate concentration
• catalysts
• competitive inhibitor