If it is calculated that less than 5% of the energy of glucose is recovered as ATP in glycolysis, the remaining energy is left in

Options

A. `CO_2` and NADPH
B. Pyruvate and `FADH_2`
C. Pyruvate and NADH
D. `CO_2 and NADH_2`

Answer

To solve the question regarding the energy recovery from glucose during glycolysis, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Glycolysis**: Glycolysis is the metabolic pathway that converts glucose into pyruvate, producing a small amount of energy in the form of ATP and NADH. It occurs in the cytoplasm and does not require oxygen.

2. **Energy Recovery in Glycolysis**: During glycolysis, glucose is broken down into two molecules of pyruvate. The process yields a net gain of 2 ATP molecules and 2 NADH molecules per glucose molecule.

3. **Calculating Energy Recovery**: If it is stated that less than 5% of the energy from glucose is recovered as ATP, this indicates that the majority of the energy remains in the products of glycolysis rather than being converted into ATP.

4. **Identifying Remaining Energy**: The remaining energy from glucose that is not converted into ATP is primarily stored in the form of pyruvate and NADH. Pyruvate is the end product of glycolysis, and NADH is a reduced coenzyme that carries energy.

5. **Selecting the Correct Option**: Based on the information that less than 5% of the energy is recovered as ATP, the remaining energy is left in pyruvate and NADH. Therefore, the correct answer to the question is option 3: "pyruvate and NADH".

### Final Answer:
The remaining energy is left in **pyruvate and NADH**.

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