Proteins Review 1. Proteins contain the following elements: \( \qquad \) carkn H , 0 , N \( \qquad \) and sometimes 2. A protein monomer is an \( \qquad \) Amino Acid .

Proteins have a fascinating history that dates back to the early 19th century when scientists began to uncover their complex structures and functions. They were first identified as vital components of living organisms by Jöns Jacob Berzelius, who coined the term "protein" in 1838. This breakthrough laid the foundation for the understanding of proteins as essential biomolecules that play crucial roles in cellular processes, metabolism, and overall biological functions. In the real world, proteins are integral to countless applications, from the food industry to pharmaceuticals. For instance, whey protein, derived from milk, is a popular supplement for fitness enthusiasts due to its muscle-building properties. Moreover, enzymes, which are proteins that catalyze biochemical reactions, are used in various industries, ranging from laundry detergents to biofuels, showcasing the versatile nature of proteins in everyday life.