During the process of glycolysis, how many molecules of $\text{ATP}$ are consumed and produced respectively per molecule of glucose to reach the stage of glyceraldehyde 3-phosphate?

Solution

1. Glucose is phosphorylated to glucose-6-phosphate consuming $1$ $\text{ATP}$.
2. Fructose-6-phosphate is phosphorylated to fructose-1,6-bisphosphate consuming another $1$ $\text{ATP}$.
3. No $\text{ATP}$ is produced until the conversion of 1,3-bisphosphoglycerate to 3-phosphoglycerate.
4. Hence the answer is (B).