A Nurse Knows That the Energy Requirements of Proteins Are

A nurse knows that the energy requirements of proteins are measured in grams and are distinguished from carbohydrates and fats in which of the following ways?

A) Proteins have nitrogen as a building-block element.
B) Carbohydrates have twice more carbon molecules.
C) Fats have less nitrogen and more hydrogen bonds.
D) Proteins have amino acids that breakdown vitamins.