In glycolysis, two redox-equivalents are removed, in the form of two hydrogen atoms from PGAL and transferred to a molecule of

Options

A. BPGA
B. `NAD^(+)`
C. Molecular oxygen
D. ATP

Answer

**Step-by-Step Solution:**

1. **Understanding Glycolysis**: Glycolysis is the metabolic pathway that converts glucose into pyruvate, generating small amounts of ATP and NADH in the process. It occurs in the cytoplasm of the cell.

2. **Identifying the Reaction**: In glycolysis, one of the key steps involves the conversion of phosphoglyceraldehyde (PGAL) into another molecule. During this process, two hydrogen atoms are removed from PGAL.

3. **Redox Equivalents**: The removal of hydrogen atoms from a molecule indicates a redox reaction, where the molecule loses electrons (is oxidized). In this case, PGAL loses two hydrogen atoms.

4. **Transfer of Hydrogen Atoms**: The hydrogen atoms that are removed from PGAL are transferred to a specific molecule that acts as an electron carrier. In glycolysis, this electron carrier is NAD+ (Nicotinamide adenine dinucleotide).

5. **Formation of NADH**: When NAD+ accepts the two hydrogen atoms, it is reduced to form NADH. This process is crucial as NADH will later be used in cellular respiration to produce ATP.

6. **Conclusion**: Therefore, the two redox equivalents (in the form of hydrogen atoms) removed from PGAL during glycolysis are transferred to NAD+, resulting in the formation of NADH.

**Final Answer**: The two redox equivalents are transferred to NAD+.

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