BRAINCAKECollagen
Collagen is a fibrous protein that is found in tendons, bones, muscles, skin and blood.
It comprises three-quarters of the skin and a third of all the protein in the human body.
The primary structure is the sequence of amino acids that gives rise to an unbranched polypeptide chain.
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Key terms in this lesson
- primary structure
- The sequence of amino acids in a polypeptide chain.
- secondary structure
- The coiling or folding of a polypeptide chain, such as into an alpha-helix or beta-pleated sheet, caused by hydrogen bonding between peptide bonds.
- tertiary structure
- The further coiling and folding of a polypeptide into a specific three-dimensional shape, held by ionic bonds, hydrogen bonds and disulfide bridges between R-groups.
- quaternary structure
- The structure formed when two or more polypeptide chains, and sometimes a non-protein prosthetic group, are held together to form a functional protein.
- fibrous protein
- A protein made of long parallel polypeptide chains with cross links, usually insoluble and with a structural role.
More in Biological Molecules
- Amino-Acids
- Peptide Bond Formation
- Primary Structure
- Secondary Structure
- Tertiary Structure
- Quaternary Structure
- Test for Proteins
- Globular and Fibrous Proteins
All 29 lessons in Biological Molecules · All AQA AS-level Biology topics