Protein | Definition, Structure, & Classification | Britannica
2024年9月23日 · A protein molecule is very large compared with molecules of sugar or salt and consists of many amino acids joined together to form long chains, much as beads are arranged on a string. There are about 20 different amino acids that occur naturally in proteins.
Protein - Wikipedia
Proteins can be informally divided into three main classes, which correlate with typical tertiary structures: globular proteins, fibrous proteins, and membrane proteins. Almost all globular proteins are soluble and many are enzymes.
What Are Proteins? Protein Definition, Functions, Examples
2017年12月13日 · Proteins are a large class of biological molecules consisting of chains of amino acids called polypeptides. A single polypeptide can make a protein, although many proteins consists of multiple polypeptide subunits.
3.7: Proteins - Types and Functions of Proteins
2023年10月31日 · Proteins are essential for the main physiological processes of life and perform functions in every system of the human body. A protein’s shape determines its function. Proteins are composed of amino acid subunits that form polypeptide chains.
Protein Structure - Biology Dictionary
2021年1月21日 · Proteins are polymers, meaning they are large molecules made up of many smaller molecules. The small molecules that make up proteins are called amino acids. Each amino acid contains a carbon atom, an amino group, a carboxyl group, and a side chain (also known as an R group).
What are proteins and what do they do? - MedlinePlus
2021年3月26日 · Proteins are large, complex molecules that play many critical roles in the body. They do most of the work in cells and are required for the structure, function, and regulation of the body’s tissues and organs.
The Shape and Structure of Proteins - Molecular Biology of the …
A protein molecule is made from a long chain of these amino acids, each linked to its neighbor through a covalent peptide bond (Figure 3-1). Proteins are therefore also known as polypeptides. Each type of protein has a unique sequence of amino acids, exactly the …
Protein Function | Learn Science at Scitable - Nature
Protein Function. The collection of proteins within a cell determines its health and function. Proteins are responsible for nearly every task of cellular life, including cell shape and inner...
Protein Structure | Learn Science at Scitable
Proteins are the workhorses of cells. Learn how their functions are based on their three-dimensional structures, which emerge from a complex folding process.
Protein - Amino Acids, Structure, Function | Britannica
2024年9月23日 · Proteins are macromolecular polypeptides—i.e., very large molecules (macromolecules) composed of many peptide-bonded amino acids. Most of the common ones contain more than 100 amino acids linked to each other in a long peptide chain.