If glycolysis starts with one glucose molecule, how many ATP molecules are used and produced, and what is the net gain?

• A. 2 ATP used, 4 ATP produced, net gain of 2 ATP
• B. 4 ATP used, 2 ATP produced, net gain of 2 ATP
• C. 2 ATP used, 2 ATP produced, net gain of 0 ATP
• D. 4 ATP used, 4 ATP produced, net gain of 0 ATP

Answer: (A)