protein
ChatGPT's explanation of "protein": Protein is a biological macromolecule composed of amino acids and is an important structural and functional component of life. They perform a variety of functions in cells, including catalyzing chemical reactions (enzymes), providing structural support (such as muscles and bones), transporting molecules (such as hemoglobin), and regulating physiological processes (such as hormones).
Definition
Proteins are polymers composed of a series of amino acids linked by peptide bonds and usually have specific three-dimensional structures and functions.
Example sentences
Protein is one of the essential nutrients for the human body and is crucial for maintaining good health.
Fish and meat are good sources of high-quality protein.
Useful examples
Food sources: Meat, fish, eggs, dairy products, beans, etc. are all foods rich in protein.
Biological function: Enzymes are special proteins that speed up chemical reactions, such as those in digestion.
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The word protein is derived from the Greek word "proteios", meaning "first" or "primary", reflecting its importance in living organisms. The study of proteins began in the 19th century. With the development of biochemistry and molecular biology, the understanding of proteins has continued to deepen.