Why is it necessary to couple some biochemical reactions to the hydrolysis of AT

Question

Why is it necessary to couple some biochemical reactions to the hydrolysis of ATP (for example, in the synthesis of glutamine from glutamic acid)?

Question 4 options:

A) the coupling of reactions decreases the G of unfavorable reactions

B) biochemical reactions with a + G require energy which can be obtained from the coupled hydrolysis of ATP to ADP + Pi (- G)

C) coupling reactions to the hydrolysis of ATP increases the rate of the reaction

D) the hydrolysis of ATP has a - G and requires coupling to obtain the energy from another reaction with a + G.

Steady state and equilibrium metabolism differ in that:

Question 5 options:

the ratio of ATP to ADP is very low under equilibrium conditions and high under steady state conditions

equilibrium is required to keep the ratio of reactants and products equal for the needs of the cell, steady state reactions do not maintain reactants and products at equal concentrations

the forward and reverse rates are the same in steady state reactions and are different at equilibrium

Equilibrium provides energy for the cell to do work, steady state reactions do not.

A)

the ratio of ATP to ADP is very low under equilibrium conditions and high under steady state conditions

B)

equilibrium is required to keep the ratio of reactants and products equal for the needs of the cell, steady state reactions do not maintain reactants and products at equal concentrations

C)

the forward and reverse rates are the same in steady state reactions and are different at equilibrium

D)

Equilibrium provides energy for the cell to do work, steady state reactions do not.

Explanation / Answer

Answer 4.

B) Biochemical reactions with a + G require energy which can be obtained from the coupled hydrolysis of ATP to ADP + Pi (- G)

Further explanation: - The biochemical reactions which have + G values are non-spontaneous. For a reaction to be spontaneous, G value should be negative. Coupling the reaction with ATP makes the value negative.

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