Question
What happens when a molecule has a phosphategroup added to it? Elimination Tool Select one answer A An addition of a phosphate group to a molecule is phosphorylating that molecule.It is an endergonic reaction. B An addition of a phosphate group to a molecule is phosphorylating that molecule It is an exergonic reaction. C An addition of a phosphate group to a molecule is making AT? D An addition of a phosphate g group to a molecule is making ADP.
Answer
3.5
(238 Votes)
Nola
Elite · Tutor for 8 years
Answer
B
Explanation
When a phosphate group is added to a molecule, it's a process called phosphorylation. Phosphorylation is a key part of several cell processes. In biochemistry, phosphorylation of a molecule is often associated with activation of a function or a change in the protein's activity. In terms of energetics, there is a debatable aspect on whether the reaction is endergonic or exergonic. To clarify, an endergonic reaction is one that requires energy to be driven. On the contrary, exergonic reaction is essentially an energy releasing process. However, the process of phosphorylation using ATP (which is more common), transforms ATP into ADP with the release of energy, hence more fundamentally, it's associated as exergonic.