Enzymes

Question 1

Are physically distinct versions of a given enzyme, each of which catalyzes the same reaction

Answer 1

Isozymes

Question 2

True or false. Enzymes lower free energy of the equilibrium of the reaction

Answer 2

False. Enzymes lower free energy of activation not reactants, products and equilibrium of reaction

Question 3

Catalyzes cleavage of C-C, C-O, C-N and other bonds by atom elimination, leaving double bonds

Answer 3

Lyases

Question 4

Catalyze geometric or structural changes within a molecule

Answer 4

Isomerases

Question 5

Catalyze the joining together of two molecules coupled to the hydrolysis of ATP

Answer 5

Ligases

Question 6

Which equation uses this formula?

Answer 6

Michaelis Menten Equation

Question 7

Describes First Order Reaction.

Answer 7

Point A. As substrate increases, velocity increases

Question 8

Describes Zero Order Reaction

Answer 8

Point C. No increase in substrate can increase the rate of velocity due to saturation.

Question 9

Substrate concentration at which Vmax/ 2.

Answer 9

Point B. Michaelis Constant (Km)

Question 10

Factors that affect rate of reaction

Answer 10

Substrate Concentration Temperature pH

Question 11

Used to calculate Km and Vmax as well as to determine the mechanism of action of enzyme inhibitors

Answer 11

Lineweaver Burk plot

Question 12

Competitive or Noncompetitive Inhibition: Can be reversed by increasing the [S]

Answer 12

Competitive

Question 13

Competitive or Noncompetitive Inhibition: Increased Km

Answer 13

Competitive

Question 14

Competitive or Noncompetitive Inhibition: Lowered Vmax

Answer 14

Noncompetitive

Question 15

Competitive or Noncompetitive Inhibition: Binds at primary site

Answer 15

Competitive

Question 16

Competitive or Noncompetitive Inhibition: Kmax unchanged

Answer 16

Noncompetitive

Question 17

Competitive or Noncompetitive Inhibition: Can be reversed by increasing [E]

Answer 17

Noncompetitive

Question 18

Catalyze transfer of phosphate group from a high-energy molecule to a substrate

Answer 18

Kinase

Question 19

Adds inorganic phosphate onto substrate without using ATP

Answer 19

Phosphorylase

Question 20

Removes phosphate group from substrate

Answer 20

Phosphatase

Question 21

Catalyze oxidation-reduction reactions

Answer 21

Dehydrogenase

Question 22

Adds hydroxyl group onto substrate

Answer 22

Hydroxylase

Question 23

Transfer CO2 groups with the help of biotin

Answer 23

Carboxylase

Question 24

Relocates a functional group within a molecule

Answer 24

Mutase