sugar is one of the main sources of what for cells

Sugar (glucose) is one of the main sources of energy for cells. To understand why, we need to understand cellular respiration.

Cellular respiration is the process through which cells convert glucose and oxygen into energy, carbon dioxide, and water. This process occurs in the mitochondria, which are the powerhouses of the cells. Glucose is broken down through a series of chemical reactions, releasing energy in the form of ATP (adenosine triphosphate).

Glucose is obtained from the food we eat. Once we consume food that contains sugar or carbohydrates, our digestive system breaks them down into glucose molecules that can be absorbed by our cells.

Now, to directly answer your question - sugar (glucose) acts as fuel for cells. It enters cells through specialized transport proteins in the cell membrane and undergoes cellular respiration to produce energy (ATP) that powers various cellular processes. This energy is essential for cell functioning, growth, and maintenance.

In summary, sugar (glucose) is a crucial source of energy for cells. It is broken down in a process called cellular respiration, producing ATP, which powers cellular activities.