B12 Bioc 5 Enzymes

Which of the following is NOT needed for a chemical reaction to occur?

• Compatibility of reagents

• An enzyme

• Contact between reagents

• Energy to break bonds in reagents

The highest energy point in a reaction is the

• Product

• Reactant

• Transition state

• Any of the above could be correct

A catalyst increases reaction rate by lowering the energy of the

• Reactants

• Products

• Transition state

• All answers are correct

True or false: an enzyme can only catalyze a single type of reaction

• True

• False

The enzyme binds its substrate in the

• Active site

• Catalysis site

• Allosteric site

• Substrate site

Which is the correct model of how enzyme work?

• Lock-and-key model

• Induced-fit model

• Active site model

• Kinetic energy model

Cofactors are often

• Proteins

• Enzymes

• Metals

• Non-metals

The reaction rate of an enzyme catalyzed reaction will increase as we add substrate until

• The enzyme is saturated

• The enzyme is overwhelmed

• The enzyme is denatured

• The enzyme is inhibited

Something other than the substrate that binds in the active site of an enzyme is called a

• Competitive inhibitor

• Non-competitive inhibitor

• Allosteric inhibitor

• Negative inhibitor

An inhibitor that binds weakly to an enzyme is called a ___ inhibitor

• Irreversible

• Reversible

• Competitive

• Non-competitive