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  1. Proteins and Polypeptides – Basics, Structures, Functions, and Properties

    Jan 13, 2026 · Each of these polypeptide chains is made up of amino acids, which are joined together in a detailed, deliberate and specific order. What do proteins do for the body? Proteins play vital roles in …

  2. Protein - Wikipedia

    Proteins perform a vast array of functions within organisms, including catalysing metabolic reactions, DNA replication, responding to stimuli, providing structure to cells and organisms, and transporting …

  3. What Are Proteins? Definition, Types & Examples - Cleveland Clinic

    Jun 24, 2025 · Proteins are molecules made of amino acids that send signals between cells, support digestion, help your muscles move and protect you from infection.

  4. Protein | Definition, Structure, & Classification | Britannica

    Dec 31, 2025 · Proteins provide many of the structural elements of a cell, and they help to bind cells together into tissues. Proteins, in the form of antibodies, protect animals from disease, and many …

  5. Protein: What It Is, Types, Uses, Needs, Deficiency

    Oct 11, 2025 · Proteins are large molecules made up of chains of amino acids that are important for cell function, tissue structure, and body regulation. Most people in the U.S. consume more protein than …

  6. Protein • The Nutrition Source

    At least 10,000 different proteins make you what you are and keep you that way. Protein is made from twenty-plus basic building blocks called amino acids. Because we don’t store amino acids, our …

  7. What is protein? High protein foods, explained by nutritionists

    Jan 19, 2026 · Many people still don’t understand how protein works, why it matters or the best ways to get enough of it in their diet. Here's what to know.

  8. Protein - National Human Genome Research Institute

    3 days ago · Proteins are large, complex molecules that play many important roles in the body. They are critical to most of the work done by cells and are required for the structure, function and regulation of …

  9. What is a Protein? Exploring Its Structure, Function, and Importance in ...

    Apr 18, 2025 · Proteins are the functional molecules in biology. They serve a vast array of roles, from catalyzing biochemical reactions to forming the structural components of cells.

  10. What are proteins and what do they do?: MedlinePlus Genetics

    Mar 26, 2021 · Proteins are made up of hundreds or thousands of smaller units called amino acids, which are attached to one another in long chains. There are 20 different types of amino acids that …