BCH 2022 Practice Exam Questions
COMPLETE SOLUTIONS
The standard free energy change for the hydrolysis of GTP (guanosine triphosphate) to GDP + Pi is - 7.3
kcal/mol, similar to that for ATP. From this information, onc
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BCH 2022 Practice Exam Questions
COMPLETE SOLUTIONS
The standard free energy change for the hydrolysis of GTP (guanosine triphosphate) to GDP + Pi is - 7.3
kcal/mol, similar to that for ATP. From this information, once can conclude the
Select one:
a. free energy of GDP and phosphate is higher than the free energy of GTP.
b. reaction is exergonic
c. reaction is endergonic
d. reaction requires energy - ✔✔b. reaction is exergonic
Refer to the figure below.
Which word best fits into this figure where the question mark is located?
Select one:
a. Metabolism
b. Catalysis
c. Energy
d. Equilibrium - ✔✔c. Energy
The high energy phosphate bond in ATP is _____ and ____ energy to break the bond.
Select one:
a. Hard to break, releases
b. Hard to break, requires
c. Easy to break, requires
d. Easy to break, releases - ✔✔c. Easy to break, requires
Match the complexes from the electron transport chain with their direct source of electrons.
Complex III
Complex I
Complex IV
Complex II - ✔✔Complex III -> Ubiquinone/Coenzyme Q
Complex I -> NADH
Complex IV -> Cytochrome C
Complex II -> Succinate/FADH2
Which of the following redox couples has the strongest affinity for electrons?
Select one:
Cytochrome c Fe3+ / cytochrome c Fe2+
O2 / H2O
FAD / FADH2
NAD+ / NADH - ✔✔O2 / H2O
In a theoretical cell type in which has the electron carriers listed below. Based on their standard
reduction potentials (E'°) in the table below. In which order are the electron carriers most likely to act in
carrying electrons?
Oxidant Reductant E`(V)
A+ AH -0.32
B1(oxidised) B2(reduced) -0.62
C3+ C2+ +0.22
D1 D2(oxidised) +0.89
E1(oxidised) E2(FPa)(reduced) +0.77
Select one:
a. D1→ B1 → A+→ C3+ → E1
b. E1 → C3+ → A+ → B1 → D1
c. B1 → A+ → C3+→ E1 → D1
d. B1 → D1→ A+ → C3+ → E1 - ✔✔c. B1 → A+ → C3+→ E1 → D1
Although molecular oxygen does not participate directly in any of the reactions in the citric acid cycle,
the cycle operates only when oxygen is present. This is because oxygen:
Select one:
A. Accepts electrons from the electron transport chain, allowing reoxidation of NADH to NAD+
B. Is necessary for producing water, which is crucial for all cellular processes
C. Removes toxic by-products of the citric acid cycle
D. Is necessary as an activator of enzymes of the cycle - ✔✔A. Accepts electrons from the electron
transport chain, allowing reoxidation of NADH to NAD+
Acetyl CoA
Select one:
A. Undergoes carboxylation to form malate
B. Levels regulate the rate of the citric acid cycle
C. Contains a high energy thioester linkage
D. Activates the enzyme pyruvate dehydrogenase - ✔✔C. Contains a high energy thioester linkage
The Citric Acid Cycle
Select one:
A. Occurs in all cells
B. Is an amphibolic pathway
C. Operates under aerobic and anaerobic conditions
D. Produces 3 FADH molecules, 1 NADH molecule and 1 GTP molecule per every cycle - ✔✔B. Is an
amphibolic pathway
What is the main energy source for the brain?
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