Which of the following is a carbohydrate?
A. Cellulose
B. Hemoglobin
C. Estrogen
D. ATP
Cellulose is a complex carbohydrate that composes the better part of the cell wall.
Hemoglobin is a protein and is found in red blood cells. Adenosine triphosphate (ATP) is a compound used by living organisms to store and use energy. Estrogen is a steroid hormone that stimulates the development of female sex characteristics.
Therefore, the Correct Answer is A.