If someone only ate chicken cooked with butter every day, they would still be starving their cells. What biomolecule would be missing from their diet?

Carbohydrates.

Explanation:

If you eat chicken cooked with butter continuously for a long period of time you would end up starving your cells of carbohydrates. As the butter would give you lipids which is a form of fatty acid and vitamins, the chicken would be a source of protein to your cells.

nucleus

would be most reasonable answer tbh

the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.