5. Enzymes

What is the term given to a biological catalyst?

• Protein

• Amino acid

• Carbohydrate

• Enzyme

What are enzymes made of?

• Carbohydrate

• Fat

• Lipid

• Protein

Is the enzyme in the diagram breaking apart a large molecule or building a large one from smaller molecules?

• Breaking apart a large molecule into smaller ones

• Building a large molecule from smaller ones

What is label 3 pointing to?

• Substrate

• Product

• Enzyme-substrate complex

• Active site

Which of the labels is pointing to the substrate?

• 1

• 2

• 4

• 5

What is the name of the model which describes how only a substrate with a complimentary shape will fit into the active site of an enzyme?

• Enzyme-substrate complex

• Lock and Key

What happens to an enzyme when it is heated to above its optimum temperature?

• Dies

• Deforms

• Denatures

• Decomposes

Which of the following best describes why the enzyme activity increases when the temperature is raised to the optimum?

• There are more successful collisions due to increased kinetic energy of the enzyme and substrate

• There are fewer successful collisions due to decreased kinetic energy of the enzyme and substrate

• There are more successful collisions due to decreased kinetic energy of the enzyme and substrate

• There are fewer successful collisions due to increased kinetic energy of the enzyme and substrate

Why can't a substrate bind to an enzyme when it is denatured?

• The substrate changes shape

• The product changes shape

• The enzyme-substrate complex changes shape

• The active site changes shape

What determines the specific shape of an enzyme?

• The sequence of glucose molecules in the carbohydrate chain

• The sequence of amino acids in the protein chain

• The sequence of fatty acids in the lipid

• The sequence of proteins in the amino acid chain