All sugars are converted to glucose 6-phosphate and enter glycolysis at phase 1, step 2.
When blood sugar levels drop, glycogen is broken down into glucose -1-phosphate, which is then converted to glucose-6-phosphate and enters glycolysis for ATP production. In the liver, galactose is converted to glucose-6-phosphate in order to enter the glycolytic pathwa
In the context of glycolysis, the major carbohydrate entering the pathway is glucose. However, other carbohydrates such as fructose (see Chapter 11) and galactose (see Chapter 12) are utilized for energy and biomass production by being oxidized within the glycolytic pathway.
Learn more about glycolysis here: