In the cells of an organism, the synthesis of biological molecules involves chemical reactions that have a positive change in free energy. Which of the following best explains the impact of this change in free energy?

Question

anonymous · Answer

It allows spontaneous reactions to occur. 
It causes a decrease in entropy. 
It causes the cell to give off heat. 
It moves the cell toward equilibrium.

anonymous · Answer

@wolfe8  please help

wolfe8 · Answer

I have no idea :? I haven't done this level of biology, or I have forgotten it

anonymous · Answer

I just did this it's c can I have a medal I need them

aaronq · Answer

Chemical reactions that have a positive change in free energy $\Delta G=+ve$ $\color{red}{absorb}$ heat, and the products are of higher energy than the reactants. I've illustrated the process in this graph: |dw:1387503709788:dw|

From $\Delta G = \Delta H - T\Delta S$, you can infer that a positive energy change can only occur in several ways. 

A decrease in entropy, $\Delta S=-ve$, causes the product of the temperature and the entropy change to be positive $(-T(-ve)=+ve)$, favouring the resultant positive energy change.

In physical terms, a synthesis reaction combines different molecules into one, decreasing the number of molecules (a decrease in the entropy of the system).

aaronq · Answer

TL;DR It causes a decrease in entropy. 
 
Although more accurately, the decrease in entropy CAUSES the positive free energy change.

beccaboo333 · Answer

@Heatherisawesome you need to explain when giving direct answers, or provide sources. Do not ask for medals, people will give them on their own free will