Multiple choice Which one isn't a function of carbohydrates they are the immediate energy for cellular activities they serve as short term energy storage used as long term energy storage they provide structural support in plants Reveal answer Fill a bubble to check yourself C Correct answer Explanation Carbohydrates are used for immediate energy (glucose) and short-term energy storage (glycogen in animals, starch in plants), as well as structural support in plants (cellulose). Long-term energy storage is primarily the function of lipids (fats).