Final answer:
Before ATP can be created by glycolysis, there must be an input of energy in the form of ATP. In the initial stage of glycolysis, glucose is phosphorylated by ATP to form glucose-6-phosphate, which is then converted into fructose-6-phosphate.
Step-by-step explanation:
Glycolysis is the first step in the breakdown of glucose, resulting in the formation of ATP.
Before ATP can be created by glycolysis, there must be an input of energy in the form of ATP.
In the initial stage of glycolysis, glucose is phosphorylated by ATP to form glucose-6-phosphate, which is then converted into fructose-6-phosphate.
This phosphorylation step requires energy from ATP and is necessary for glycolysis to proceed.