Question

Which step(s) in glycolysis require the input of energy?

• A. The glucose priming step
• B. The phosphorylation of glucose
• C. The phosphorylation of fructose 6-phosphate
• D. All of these steps require the input of energy

Answer 1

The correct option is D All of these steps require the input of energy

There are two phases of glycolysis. Priming phase because it requires an input of energy in form of 2 ATPs per glucose molecule and the pay off phase because energy is released in the form of 4 ATPs. The phosphorylation of glucose uses ATP mas the source of phosphate and produce glucose$-6-$phosphate. The second ATP is used in phosphorylation of fructose$-6-$phosphate to fructose$-6-$bisphosphate. All of the given steps requires the input of energy.