Quiz on Enzymes

What are enzymes?

• Lipids

• Carbohydrates

• Biological catalysts

• Nucleic acids

Which of the following is true about enzymes?

• They are consumed in reactions

• They accelerate chemical reactions

• They are simple sugars

• They have no specific substrates

What is the substrate?

• The product of the reaction

• The enzyme

• The reactant that the enzyme acts on

• A cofactor

What does the active site of an enzyme do?

• Catalyzes the reaction

• Binds the substrate

• Inhibits other enzymes

• Changes shape permanently

In the Lock and Key model, how do the enzyme and substrate interact?

• The enzyme changes shape

• They fit together perfectly

• The substrate binds randomly

• The substrate alters the enzyme's function

Which model describes the enzyme adapting to fit the substrate?

• Lock and Key Model

• Induced Fit Model

• Competitive Inhibition Model

• Noncompetitive Inhibition Model

Cofactors are:

• Always proteins

• Nonprotein molecules assisting enzyme function

• Only found in bacteria

• The same as substrates

Which of the following is NOT a type of cofactor?

• Metal ions

• Coenzymes

• Amino acids

• Prosthetic groups

What is an example of an irreversible inhibitor?

• Competitive inhibitors

• Heavy metals

• Coenzymes

• Allosteric activators

Competitive inhibitors:

• Bind permanently to the enzyme

• Resemble the substrate and compete for the active site

• Bind to the allosteric site

• Enhance enzyme activity