Proteins are essential because they contain?

The choice indicating that proteins contain all amino acids is correct because proteins are composed of long chains of amino acids, which are the building blocks of protein. There are 20 different amino acids that can be combined in various sequences to form different proteins, and out of these, nine are considered essential amino acids because the body cannot produce them and must obtain them from food.

Proteins play a crucial role in various bodily functions, including muscle repair, immune function, hormone production, and the synthesis of enzymes. Without adequate protein intake that includes all essential amino acids, the body may experience deficits in these critical functions.

In contrast, while simple sugars, fatty acids, and vitamins and minerals are important macronutrients and micronutrients in the diet, they do not directly relate to the composition of proteins. Each serves distinct roles in metabolism and health but lacks the specific connection to amino acids that defines the function and structure of proteins.