Glycolysis yields a net gain of two molecules of what energy currency?

Glycolysis yields a net gain of two molecules of what energy currency?

• A. Adenosine triphosphate
• B. Nicotinamide adenine dinucleotide
• C. Adenosine diphosphate
• D. Glucose

Answer: (A)

Glycolysis yields ATP, the cell’s energy currency, through substrate-level phosphorylation. In one glucose molecule, two ATP are used early to prime the stage, but four ATP are produced later, giving a net gain of two ATP. This direct production of ATP is what the pathway supplies as usable energy right away. NADH is also generated along the way and will be valuable for generating more ATP later in respiration, but it’s not the net ATP produced in glycolysis. ADP isn’t the energy currency itself—it's the substrate that ATP is made from—and glucose is simply the starting molecule.

Glycolysis yields ATP, the cell’s energy currency, through substrate-level phosphorylation. In one glucose molecule, two ATP are used early to prime the stage, but four ATP are produced later, giving a net gain of two ATP. This direct production of ATP is what the pathway supplies as usable energy right away. NADH is also generated along the way and will be valuable for generating more ATP later in respiration, but it’s not the net ATP produced in glycolysis. ADP isn’t the energy currency itself—it's the substrate that ATP is made from—and glucose is simply the starting molecule.