Chapter 6 Quiz

D

2. Which type of enzyme breaks bonds without the use of water? a. Hydrolase b. Ligase c. Transferase d. Lyase

A

On the image, which letter represents the substrate? A B C D

A

Which type of enzyme catalyses a reaction with 2 substrates converting to 1 product? A. Ligase B. Isomerase C. Hydrolase D. Transferase

E

The active site of an enzyme a) remains rigid and does not change shape. b) is found at the center of globular enzymes. c) is complementary to the rest of the molecule. d) contains amino acids without sidechains. e) None of the above choices are correct.

B

The presence of an electron acceptor such as NAD+ indicates which type of enzyme? A. Lyase B. Oxidoreductase C.Hydrolase D. Transferase

A

The reaction below is an example of which enzyme class? A. Isomerases B. Ligases C. Hydrolyases D. Lyases

C

The reaction below is an example of which enzyme class? A. Oxidoreductase B. Transferase C. Isomerase D. Ligase

C

The reaction below is an example of which enzyme class? A. Oxidoreductase B. Translocases C. Hydrolyases D. Lyases

D

The reaction below is an example of which enzyme class? A. Oxidoreductase B. Translocases C. Hydrolyases D. Lyases

C

The reaction below is an example of which enzyme class? A. Transferases B. Hydrolases C. Lyases D. Oxidoreductase

D

The reaction below is an example of which enzyme class? A. Transferases B. Isomerases C. Translocase D. Ligase

D

The reaction below is an example of which enzyme class? A. Transferases B. Ligases C. Lyases D. Oxidoreductase

B

What is a clue to look for to know a reaction is catalyzed by an oxidoreductase enzyme? A. Loss of a functional group B. Loss of a hydrogen C. Loss of water D. Loss of a substrate

D

Which of the following enzyme classes catalyze reactions in which two molecules are covalently connected to each other? A. Kinase B. Lyase C. Isomerase D. Ligase

A

Which of the following is a clue to look for in reactions catalyzed by lyase enzymes? A. New double bonds or rings B. Water as a reactant C. Functional groups appearing D. ATP as a reactant

A

Which of the following is true concerning the induced fit model of enzyme catalysis? A. The active site can be influenced by molecules binding elsewhere on an enzyme B. The initial binding of enzyme and substrate is the most tightly bound conformation C. The induced fit must occur prior to the initial binding of enzyme and substrate in order for the reaction to proceed D. The binding of enzyme and substrate is weakest in the transition state

A

Which of the following is true of enzymes? I. They increase the rate of reaction by stabilizing the transition state II. They raise activation energy to shift the equilibrium to favor the products III. They lower activation energy by altering the products of a reaction Choose one: A. I only B. II +III C I + III D. III only

D

Which of the following is true regarding prosthetic groups? A. They are coenzymes B. They are covalently bonded C. They are the most active form of the enzyme D. A & B are correct E. B & C are correct

D

Which of the following statements is false? A. The reaction equilibrium is determined only by the free energy difference between products and reactants B. Enzymes facilitate the formation of the transition state C. Enzymes alter the reaction rate only D. Enzymes alter the reaction rate and the reaction equilibrium

C

Which of the statements regarding enzymes is false? a) Enzymes are proteins that function as catalysts. b) Enzymes are specific. c) Enzymes provide activation energy for reactions. d) Enzyme activity can be regulated. e) Enzymes may be used many times for a specific reaction.

C

1. Which class of enzyme would catalyze a reaction where the chemical formula does not change? A. Oxidoreductase B. Transferase C. Isomerase D. Ligase

D

If an enzyme functions to enable the following reaction, which type of catalytic strategy is most likely, given the chemical reaction shown? A. Proximity/Orientation catalysis B. Electrostatic catalysis C. Covalent catalysis D. Acid/Base catalysis

B

Kinases and aminases are examples of which class of enzyme? A. Isomerase B. Transferase C. Oxidoreductase D. Lyase

B

On the image, which letter represents the enzyme? A B C D

C

On the image, which letter represents the product of the reaction? A B C D