Questions: List the events of glycolysis in order (some steps are missing): (i) Instructions phosphorylation of glucose ATP is formed NAD is reduced to NADH glucose is broken into two 3 -carbon molecules

The correct order of the events in glycolysis, based on the provided steps, is as follows:

1. Phosphorylation of glucose
2. Glucose is broken into two 3-carbon molecules
3. NAD is reduced to NADH
4. ATP is formed

Explanation:

1. Phosphorylation of glucose: This is the first step in glycolysis where glucose is phosphorylated to form glucose-6-phosphate. This step is crucial for trapping glucose within the cell and preparing it for further breakdown.

2. Glucose is broken into two 3-carbon molecules: The 6-carbon glucose molecule is split into two 3-carbon molecules, known as glyceraldehyde-3-phosphate (G3P) and dihydroxyacetone phosphate (DHAP). DHAP is then converted into G3P, so there are two G3P molecules.

3. NAD is reduced to NADH: During the conversion of G3P to 1,3-bisphosphoglycerate, NAD+ is reduced to NADH. This step is important for capturing high-energy electrons that will be used later in cellular respiration.

4. ATP is formed: ATP is generated in the later steps of glycolysis through substrate-level phosphorylation. This occurs when 1,3-bisphosphoglycerate is converted to 3-phosphoglycerate and when phosphoenolpyruvate is converted to pyruvate.

In summary, the sequence of events in glycolysis involves the initial phosphorylation of glucose, its breakdown into two 3-carbon molecules, the reduction of NAD+ to NADH, and the formation of ATP.