Enzyme Lock and Key Theory

What is the role of enzymes in the body?

• To slow down reactions

• To speed up reactions

• To break down larger molecules

• To build smaller molecules

What is the function of the substrate in enzyme reactions?

• To bind the active site of the enzyme

• To break down the enzyme

• To inhibit the enzyme activity

• To form the enzyme-substrate complex

What is the analogy used to describe the specificity of enzyme-substrate binding?

• Lock and key

• Hammer and nail

• Pen and paper

• Scissors and paper

What happens when a substrate binds to the active site of an enzyme?

• The enzyme becomes inactive

• The enzyme breaks down into smaller molecules

• The enzyme-substrate complex is formed

• The enzyme loses its specificity

What can enzymes do to molecules?

• Break them down into smaller molecules

• Combine them to form larger molecules

• Both break them down and combine them

• Neither break them down nor combine them