Unit 3 Test 1 Review

Which phrase best describes an exothermic chemical reaction?

• is in a state of equilibrium

• releases more energy than it absorbs

• Does not absorb any energy.

• Forms products with higher bond energy than reactants.

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 .

• catalyzed

• anabolic

•  exothermic

•  endothermic.

What type of reaction takes place when fireflies give off light?

• catalyzed

• anabolic

• exothermic

• endothermic

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

• catalyst

• reactant

• product

• substrate

What does an enzyme do to a reaction?

• slows it down

• speeds it up

• causes the reaction to end

• causes it to stay the same speed

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 .

• monomer

• substrate

• polymer

• complimentary base

Reactants bind to enzymes at the .

• product

• substrate

• active site

• activation energy