BIOMOLECULES AND ENZYMES

Detailed explanation-1: -How many calories are in one gram of fat, carbohydrate, or protein? Carbohydrates provide 4 calories per gram, protein provides 4 calories per gram, and fat provides 9 calories per gram.

Detailed explanation-2: -A gram of protein has 4 calories. A gram of fat has 9 calories-more than twice as much as the other two.

Detailed explanation-3: -A gram of protein is always four calories, but you will have to use energy to digest it. The energy needed to digest protein is 0.8-1.2 calories per gram, leaving you effectively with 2.8-3.2 surplus calories per gram of protein. Pure amino acids are “pre-digested” and should thus be quite close to 4 calories per gram.