OpenStudy (austin8509):

1. Carbohydrates, such as glucose, are excellent sources of immediate energy for living organisms. More complex carbohydrates, such as glycogen and starch, can also be used for the long term storage of energy. However, carbohydrates play other vital roles, too. Which of the following describes another common use for carbohydrates? A. Enzymes help speed up metabolic reactions. B. Keratin provides support in hair, nails, feathers, hooves, and some animal shells. C. Collagen is a major component in cartilage and tendons. D.Cellulose is used as a structural component in plant cell walls.

OpenStudy (prakharluv):

According to me, option D. Cellulose is used as a structural component in plant cell walls is correct answer for your question. Because, Cellulose is a type of carbohydrate and we know that it can be used as structural component, while Enzymes, Keratin and Collagen are basically proteins.