Coupled Reaction Processes

Question 1

Which of the following reactions exemplifies the water-mediated
breakdown of adenosine triphosphate?

A. ATP + H2O ⇋ ADP+Pi+energy
B. ATP + O ⇋ ADP+Pi+H2 + energy
C. ATP + H2O ⇋ ADP+Pi+O2+energy
D. ATP + ADP ⇋ ADP+H20+Pi+energy

Answer 1

A. ATP + H2O ⇋ ADP+Pi+energy

Question 2

Which of the following statement BEST describes the hydrolysis of ATP
to ADP?

A. It is non- reversible chemical reaction
B. Replacement of ATP molecules is unevenly produced.
C. As ATP regenerates, cells produce more units of ATP molecules.
D.As a reverse reaction, ATP from ADP yields to an inorganic phosphate
group

Answer 2

D.As a reverse reaction, ATP from ADP yields to an inorganic phosphate
group

Question 3

How is the energy released by ATP hydrolysis used to power other reactions in a cell?

Answer 3

A.Energetically favorable reaction links with an energetically
unfavorable reaction.

Question 4

When reaction coupling involves ATP, what by-product serves to be a shared intermediate?

Answer 4

Phosphorylated molecule

Question 5

Which of the following sentences does NOT support the processes
happening in a Sodium-Potassium pump?

A. ATP provides energy for the transport of sodium and potassium by
way of a membrane-embedded protein.
B. ATP transfers one of its phosphate groups to the pump protein,
forming ADP and a phosphorylated “intermediate” form of the
pump.
C. A potassium ion binds to the phosphorylated pump, making the
protein stable in its inward-facing form.
D. The protein becomes more stable by returning to its original shape,
releasing the potassium ions inside the cell.

Answer 5

C. A potassium ion binds to the phosphorylated pump, making the

Question 6

The body performs many processes that depend upon energy and could not occur without a supply of ATP. How does the energy from ATP power the cellular reactions?

Answer 6

The cellular processes are coupled to hydrolysis of ATP, an exergonic
process

Question 7

Which of the following would you expect to have a high phosphate group
transfer potential?

a. ATP
b. GMP
c. ADP
d. Phosphoric acid

Answer 7

a. ATP

Question 8

ΔG for an exothermic reaction has a:

Answer 8

A value that varies with the temperature of the reaction

Question 9

When we digest food and use it to produce energy, we convert a few large, complex molecules into many small, simple molecules. Under these circumstances,

a. Entropy increases
b. Entropy decreases
c. Entropy does not change
d. Entropy rises, then falls

Answer 9

a. Entropy increases

Question 10

Respiration may be represented by the reaction:
C6H12O6 + 6O2 → 6CO2 + 6H2O ΔH for the overall reaction is 2802.1 kJ/mol. Photosynthesis is the reverse: 6CO2 + 6H2O → C6H12O6 + 6O2 ΔH for the
overall reaction of photosynthesis is:

a. 2802.1 kJ/mol
b. -2802.1 kJ/mol
c. -304.7 kcal/mol
d. 304.7 kcal/mol

Answer 10

d. 304.7 kcal/mol