# Which of the following is not a function of proteins ?

$(a)\;Nail\;formation\qquad(b)\;Skin\;formation\qquad(c)\;Muscle\;formation\qquad(d)\;Providing\;energy\;for\;metabolism$

Answer : Providing energy for metabolism
Explanation :
Carbohydrates provide energy for metabolism . Protein is involved in nail , skin & muscle formation .