Which one of the statement given below is not correct 

(a) Kreb’s cycle is a common pathway of oxidative breakdown of carbohydrates, fatty acids and amino acids 

(b) The energy present in one gram carbohydrate in 4.4 kcal or 18.4 kJ 

(c) When protein are used as respiratory substrate respiration is called protoplasmic respiration 

(d) the energy present in one gram of fat is 4.8 k cal or 20 kJ