At the end of glycolysis, X is the net energy gain from one molecule of glycose via Y, but there is also energy stored in the form of Z. Identify X,Y and Z.

Options

A. `{:(X,Y,Z),(1ATP,"Oxidative phosphorylation",NADH+H^(+)):}`
B. `{:(X,Y,Z),(2ATPs,"Oxidative phosphorylation",NADH+H^(+)):}`
C. `{:(X,Y,Z),(1ATP,"Substrate level phosphorylation",FADH_(2)):}`
D. `{:(X,Y,Z),(2ATPs,"Substrate level phosphorylation",NADH +H^(+)):}`

Answer

To solve the question, we need to identify three components related to glycolysis: X, Y, and Z.

1. **Understanding Glycolysis**: Glycolysis is the metabolic pathway that breaks down one molecule of glucose into two molecules of pyruvate. This process occurs in the cytoplasm of the cell and is anaerobic, meaning it does not require oxygen.

2. **Identifying X (Net Energy Gain)**: At the end of glycolysis, the net energy gain from one molecule of glucose is in the form of ATP. Glycolysis produces a total of 4 ATP molecules, but since 2 ATP molecules are consumed in the initial steps, the net gain is 2 ATP.

- **X = 2 ATP**

3. **Identifying Y (Type of Phosphorylation)**: The ATP that is produced during glycolysis is generated through a process called substrate-level phosphorylation. This is a direct method of synthesizing ATP by transferring a phosphate group from a substrate to ADP.

- **Y = Substrate-level phosphorylation**

4. **Identifying Z (Stored Energy)**: In addition to ATP, glycolysis also produces NADH (nicotinamide adenine dinucleotide), which is a carrier of electrons and stores energy in the form of high-energy electrons. This NADH can later be used in the electron transport chain to produce more ATP.

- **Z = NADH + H⁺**

In conclusion, the identified components are:
- X = 2 ATP (net energy gain)
- Y = Substrate-level phosphorylation (the process)
- Z = NADH + H⁺ (stored energy)

### Summary:
- **X**: 2 ATP
- **Y**: Substrate-level phosphorylation
- **Z**: NADH + H⁺