Which of the following shows the correct changes in thermodynamic properties for a chemical reaction in which amino acids are linked to form a protein?
A) +ΔH, +ΔS, +ΔG
B) +ΔH, -ΔS, -ΔG
C) +ΔH, -ΔS, +ΔG
D) -ΔH, -ΔS, +ΔG
E) -ΔH, +ΔS, +ΔG

Question

Quizplus · Accepted Answer

The formation of a protein by linking amino acids involves a condensation reaction, which results in the loss of a water molecule. As a result, the reaction is endothermic (+ΔH) and has a decrease in entropy (-ΔS). The free energy change is positive (+ΔG) because the formation of a peptide bond is not spontaneous under standard conditions. Therefore, the correct changes in thermodynamic properties for this reaction are +ΔH, -ΔS, +ΔG, which correspond to option C.

Which of the Following Shows the Correct Changes in Thermodynamic