BIO 311C ICAS QUESTIONS AND ANSWERS A+
GRADED
1) Which of the following in an anabolic process that is endergonic and
endothermic?
A) ATP + H 2 O à ADP + Pi
B) C 6 H 12 O 6 + 6O 2 à 6CO 2 + 6H 2 O
C) CO 2 + H 2 O à CH 2 O + O 2
D) FADH 2 à FAD + H 2
E) CH 4 + 2O 2 à CO 2 + 2H 2 O
C) CO₂ + H₂O → CH₂O + O₂
This is an anabolic process (building complex molecules from simpler ones) that is
also endergonic (requires an input of energy) and endothermic (absorbs heat). This
reaction represents photosynthesis, where carbon dioxide and water combine to form
carbohydrates, requiring energy input, typically from sunlight, to proceed.
4) 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
5) Melting of an ice at room temperature results in the following changes in free
energy, enthalpy andentropy.
A) + Δ G, + Δ H, + Δ S
B) + Δ G, - Δ H, + Δ S
C) + Δ G, - Δ H, - Δ S
D) - Δ G, + Δ H, + Δ S
E) - Δ G, + Δ H, - Δ S
D) - Δ G, + Δ H, + Δ S
Explanation:
Melting of ice at room temperature is a spontaneous process, so ΔG\Delta GΔG is
negative.
During melting, heat is absorbed by the system to break hydrogen bonds, making ΔH\
Delta HΔH positive (endothermic).
Melting increases the disorder of the system (solid to liquid), so ΔS\Delta SΔS is
positive.
Thus, the correct set of changes is - Δ G, + Δ H, + Δ S.
ATP Hydrolysis yields 7.3 Kcal/mol free energy and it is coupled with many
enzyme reactionsthat would not otherwise happen.
, Which of the following reaction can be coupled with ATPhydrolysis 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
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
A) Enzyme alone
The reaction as shown below, with reference to FAD, is a __________________
process and ___________ is the ______________(oxidizing or reducing) agent.
FAD + X-H 2 FADH 2 + X
A) reduction.... X-H 2 ...oxidizing
B) oxidation.....FAD....reducing
C) reduction... X-H 2 ...reducing
D) oxidation.... FAD ...oxidizing
E) oxidation.... X-H 2 ...oxidizing
A) reduction.... X-H 2 ...oxidizing
When mice were fed with radioactive carbon in glucose (C 6 H 12 O 6 ) all the 6
CO 2 molecules will be released during which of the following process
A) Krebs cycle and Oxidative phosphorylation
B) Gycolysis and acetyl CoA formation
C) Glycolysis and Krebs cycle
D) Acetyl CoA formation and Krebs cycle
E) Glycolysis and oxidative phosphorylation
D) Acetyl CoA formation and Krebs cycle
Which of the following would slow down or inhibit key enzymes of Krebs cycle
and glycolysis?
A) Excess amount of ADP and Pi
B) Limited amount of ATP
C) Excess amount of NAD+.
D) Excess amount of citrate. E) Limited amount of FADH 2
D) Excess amount of citrate.
Which of the following poison can inhibit the generation of Δ [H + ]?
A) A poison that would inhibit ATP synthase and block protons coming through.
B) A chemical that would inhibit citrate synthase
GRADED
1) Which of the following in an anabolic process that is endergonic and
endothermic?
A) ATP + H 2 O à ADP + Pi
B) C 6 H 12 O 6 + 6O 2 à 6CO 2 + 6H 2 O
C) CO 2 + H 2 O à CH 2 O + O 2
D) FADH 2 à FAD + H 2
E) CH 4 + 2O 2 à CO 2 + 2H 2 O
C) CO₂ + H₂O → CH₂O + O₂
This is an anabolic process (building complex molecules from simpler ones) that is
also endergonic (requires an input of energy) and endothermic (absorbs heat). This
reaction represents photosynthesis, where carbon dioxide and water combine to form
carbohydrates, requiring energy input, typically from sunlight, to proceed.
4) 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
5) Melting of an ice at room temperature results in the following changes in free
energy, enthalpy andentropy.
A) + Δ G, + Δ H, + Δ S
B) + Δ G, - Δ H, + Δ S
C) + Δ G, - Δ H, - Δ S
D) - Δ G, + Δ H, + Δ S
E) - Δ G, + Δ H, - Δ S
D) - Δ G, + Δ H, + Δ S
Explanation:
Melting of ice at room temperature is a spontaneous process, so ΔG\Delta GΔG is
negative.
During melting, heat is absorbed by the system to break hydrogen bonds, making ΔH\
Delta HΔH positive (endothermic).
Melting increases the disorder of the system (solid to liquid), so ΔS\Delta SΔS is
positive.
Thus, the correct set of changes is - Δ G, + Δ H, + Δ S.
ATP Hydrolysis yields 7.3 Kcal/mol free energy and it is coupled with many
enzyme reactionsthat would not otherwise happen.
, Which of the following reaction can be coupled with ATPhydrolysis 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
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
A) Enzyme alone
The reaction as shown below, with reference to FAD, is a __________________
process and ___________ is the ______________(oxidizing or reducing) agent.
FAD + X-H 2 FADH 2 + X
A) reduction.... X-H 2 ...oxidizing
B) oxidation.....FAD....reducing
C) reduction... X-H 2 ...reducing
D) oxidation.... FAD ...oxidizing
E) oxidation.... X-H 2 ...oxidizing
A) reduction.... X-H 2 ...oxidizing
When mice were fed with radioactive carbon in glucose (C 6 H 12 O 6 ) all the 6
CO 2 molecules will be released during which of the following process
A) Krebs cycle and Oxidative phosphorylation
B) Gycolysis and acetyl CoA formation
C) Glycolysis and Krebs cycle
D) Acetyl CoA formation and Krebs cycle
E) Glycolysis and oxidative phosphorylation
D) Acetyl CoA formation and Krebs cycle
Which of the following would slow down or inhibit key enzymes of Krebs cycle
and glycolysis?
A) Excess amount of ADP and Pi
B) Limited amount of ATP
C) Excess amount of NAD+.
D) Excess amount of citrate. E) Limited amount of FADH 2
D) Excess amount of citrate.
Which of the following poison can inhibit the generation of Δ [H + ]?
A) A poison that would inhibit ATP synthase and block protons coming through.
B) A chemical that would inhibit citrate synthase
