BIO 311C Exam 3 QUESTIONS AND ANSWERS A+
GRADED
Which of the following in an anabolic process that is endergonic and
endothermic?
A) ATP + H2O → ADP + Pi
B) C6H12O6 + 6O2 → 6CO2 + 6H2O
C) CO2 + H2O → CH2O + O2
D) FADH2 → FAD + H2
E) CH4 + 2O2 → CO2 + 2H2O
C) CO2 + H2O → CH2O + O2
Which of the following represents potential energy?
A) Chemical bonds
B) Water in a dam
C) Charged battery
D) A and B only
E) A, B and C are correct
E) A, B and C are correct
What is the relation between exergonic and exothermic reactions?
A) They are typically unrelated, but can be coupled with ATP hydrolysis
B) Every exothermic reaction leads to a subsequent exergonic one
C) Every exergonic reaction is also an exothermic one
D) Both result in a reduction of entropy in the universe
E) Exothermic reactions may be endergonic or exergonic processes
E) Exothermic reactions may be endergonic or exergonic processes
The free energy change of a system is: ∆G = ∆H - T ∆S. Which of the following is
incorrect?
A)∆G can be negative if enthalpy decreases.
B)T is the absolute temperature and can change the ∆G.
,C)∆G can be negative if entropy and temperature increases
D)∆S is the change in entropy and ∆H is change in enthalpy.
E)A positive ∆H and negative ∆S can make ∆G negative
E)A positive ∆H and negative ∆S can make ∆G negative
Melting of an ice at room temperature results in the following changes in free
energy, enthalpy and entropy.
A)+ΔG, +ΔH, +ΔS
B)+ΔG, -ΔH, +ΔS
C)+ΔG, -ΔH, -ΔS
D)-ΔG, +ΔH, +ΔS
E)-ΔG, +ΔH, -ΔS
D)-ΔG, +ΔH, +ΔS
What is an example of a reaction that is spontaneous but results in decrease of
entropy within the system?
formation of water
A reaction was started with 40 mM substrate and it reached equilibrium in 2
hours.
At equilibrium, the substarte concentration was 10 mM and the rest was
converted to product.
What is the Keq in this reaction?
3
The Keq for a reaction is 4 with a substrate concentration of 10 mM and a product
concentration of 40 mM at equilibrium.
What will be the Keq if the reaction was started with 10 times higher
concentration of substrate compared to the above reaction?
4
ATP Hydrolysis yields 7.3 Kcal/mol free energy and it is coupled with many
enzyme reactions that would not otherwise happen. Which of the following
reaction can be coupled with ATP hydrolysis to become a favorable or
spontaneous reaction. A reaction with a ΔG value of _______ Kcal/mol.
A)-5.8
B)4.3
C)10.5
D)-5.3
, E)-7.3
B)4.3
Enzymes are able to catalyze reactions by __________________________
A)Lowering the free energy of reactants
B)Lowering the free energy of products
C)Lowering the enthalpy
D)Lowering the entropy
E)Lowering the activation energy
E)Lowering the activation energy
Given the same concentration of substrate as Km, which of the following will
yield the maximum amount of products?
A)Enzyme alone
B)Enzyme + substrate alone
C)Enzyme + substrate + competitive inhibitor
D)Enzyme + substrate + non-competitive inhibitor
E)Enzyme + Substrate + Activator
E)Enzyme + Substrate + Activator
An enzyme was tested with two different substrates A and B resulting in products
X and Y. The Km for substrate A was 10 mM and the Km for substrate B was 100
mM. Which of the following statement is correct?
A)Substrate A is less effective than substrate B to have same amount of products
formed.
B)Substrate B is less effective than substrate A to have same amount of products
formed.
C)There is no difference between A and B in terms of products formed.
D)X is produced less than Y with same amount of substrate used.
E)Y is produced at same level as X with same amount of substrate used.
B)Substrate B is less effective than substrate A to have same amount of products
formed.
An Asian and a Caucasian walk into a bar and started drinking the same type of
alcoholic drink. Who will get drunk first?
A)Both at same time
GRADED
Which of the following in an anabolic process that is endergonic and
endothermic?
A) ATP + H2O → ADP + Pi
B) C6H12O6 + 6O2 → 6CO2 + 6H2O
C) CO2 + H2O → CH2O + O2
D) FADH2 → FAD + H2
E) CH4 + 2O2 → CO2 + 2H2O
C) CO2 + H2O → CH2O + O2
Which of the following represents potential energy?
A) Chemical bonds
B) Water in a dam
C) Charged battery
D) A and B only
E) A, B and C are correct
E) A, B and C are correct
What is the relation between exergonic and exothermic reactions?
A) They are typically unrelated, but can be coupled with ATP hydrolysis
B) Every exothermic reaction leads to a subsequent exergonic one
C) Every exergonic reaction is also an exothermic one
D) Both result in a reduction of entropy in the universe
E) Exothermic reactions may be endergonic or exergonic processes
E) Exothermic reactions may be endergonic or exergonic processes
The free energy change of a system is: ∆G = ∆H - T ∆S. Which of the following is
incorrect?
A)∆G can be negative if enthalpy decreases.
B)T is the absolute temperature and can change the ∆G.
,C)∆G can be negative if entropy and temperature increases
D)∆S is the change in entropy and ∆H is change in enthalpy.
E)A positive ∆H and negative ∆S can make ∆G negative
E)A positive ∆H and negative ∆S can make ∆G negative
Melting of an ice at room temperature results in the following changes in free
energy, enthalpy and entropy.
A)+ΔG, +ΔH, +ΔS
B)+ΔG, -ΔH, +ΔS
C)+ΔG, -ΔH, -ΔS
D)-ΔG, +ΔH, +ΔS
E)-ΔG, +ΔH, -ΔS
D)-ΔG, +ΔH, +ΔS
What is an example of a reaction that is spontaneous but results in decrease of
entropy within the system?
formation of water
A reaction was started with 40 mM substrate and it reached equilibrium in 2
hours.
At equilibrium, the substarte concentration was 10 mM and the rest was
converted to product.
What is the Keq in this reaction?
3
The Keq for a reaction is 4 with a substrate concentration of 10 mM and a product
concentration of 40 mM at equilibrium.
What will be the Keq if the reaction was started with 10 times higher
concentration of substrate compared to the above reaction?
4
ATP Hydrolysis yields 7.3 Kcal/mol free energy and it is coupled with many
enzyme reactions that would not otherwise happen. Which of the following
reaction can be coupled with ATP hydrolysis to become a favorable or
spontaneous reaction. A reaction with a ΔG value of _______ Kcal/mol.
A)-5.8
B)4.3
C)10.5
D)-5.3
, E)-7.3
B)4.3
Enzymes are able to catalyze reactions by __________________________
A)Lowering the free energy of reactants
B)Lowering the free energy of products
C)Lowering the enthalpy
D)Lowering the entropy
E)Lowering the activation energy
E)Lowering the activation energy
Given the same concentration of substrate as Km, which of the following will
yield the maximum amount of products?
A)Enzyme alone
B)Enzyme + substrate alone
C)Enzyme + substrate + competitive inhibitor
D)Enzyme + substrate + non-competitive inhibitor
E)Enzyme + Substrate + Activator
E)Enzyme + Substrate + Activator
An enzyme was tested with two different substrates A and B resulting in products
X and Y. The Km for substrate A was 10 mM and the Km for substrate B was 100
mM. Which of the following statement is correct?
A)Substrate A is less effective than substrate B to have same amount of products
formed.
B)Substrate B is less effective than substrate A to have same amount of products
formed.
C)There is no difference between A and B in terms of products formed.
D)X is produced less than Y with same amount of substrate used.
E)Y is produced at same level as X with same amount of substrate used.
B)Substrate B is less effective than substrate A to have same amount of products
formed.
An Asian and a Caucasian walk into a bar and started drinking the same type of
alcoholic drink. Who will get drunk first?
A)Both at same time
