Enzymes Quiz

What is a catalyst?

• A substance that is used up in a chemical reaction

• A substance that slows down a chemical reaction

• A substance that increases the speed of a chemical reaction

• A substance that changes its shape during a chemical reaction

Why are enzymes important to living cells?

• To increase the temperature of the cell

• To damage the cells

• To carry out slow chemical reactions

• To speed up chemical reactions

What are enzymes made of?

• Lipids

• Nucleic acids

• Carbohydrates

• Proteins

What is the unique region of an enzyme that is complementary to the substrates of a reaction?

• Catalytic site

• Binding site

• Inactive site

• Active site

What is the function of the active site of an enzyme?

• To produce the products

• To repel the substrates

• To bind to the substrates

• To change shape during a reaction

What is the lock and key model of enzyme action based on?

• The enzyme being used up in the process

• The enzyme repelling the substrates

• The substrate fitting perfectly into the active site

• The enzyme changing shape as it binds to the substrate

What is the induced fit model of enzyme action compared to?

• Molding clay into a shape

• Mixing two chemicals together

• Fitting a key into a lock

• Putting your hand into a rubber glove

What is the main reason for using a catalyst in a chemical reaction?

• To increase the speed of the reaction

• To change the color of the reaction

• To produce a strong odor in the reaction

• To decrease the temperature of the reaction

What is the problem with increasing the temperature to speed up chemical reactions?

• It requires a huge amount of energy

• It damages the cells

• It slows down the reaction

• It decreases the rate of non-useful reactions

What is the shape of an enzyme determined by?

• The temperature of the environment

• The sequence of amino acids in the chain

• The type of substrate it binds to

• The pH level of the environment