Which is a difference between proteins and carbohydrates and fats?
proteins are macromolecules; carbohydrates and fats are not.
proteins are composed of monomers; carbohydrates and fats are not.
carbohydrates and fats contain carbon, hydrogen, and oxygen; proteins do not.
excess carbohydrates and fats are stored; excess proteins are not.

D

Explanation:

excess carbohydrates and fats are stored as glycogen ; excess proteins are not.

Excess carbohydrates and fats are stored; excess proteins are not.

Explanation:

Carbohydrates and fats are the bio-molecules which can be stored in the body for later use if they are present in excess in the body. While carbohydrates are stored in the form of glycogen in liver (in plants, carbohydrates are stored in the form of starch), fats are stored in the form of triglycerides in adipose tissues. But, proteins are not stored in the body for later use. Although in energy deficient conditions when the entire carbohydrate and fat reserves are used up, proteins can be used to generate energy for the body yet they are not actually stored in the body for future use.