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Biology 2nd Baccalaureate

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4.4. Protein

Protein concept

The proteins are compounds formed by the union of amino acids.

As we have already seen, the chemical bonds that join amino acids are called peptide bonds, and the chains formed, peptides.

The oligopeptides are two to ten amino acids. If the number of amino acids that make up a peptide is two, it is called a dipeptide;if it is three, tripeptide, etc.

If the peptide has more than ten amino acids it is called a polypeptide, and if it consists of more than fifty amino acid molecules or if its molecular mass is greater than 5000 amu, it is called a protein.

Proteins are synthesized on ribosomes, globular organelles made up of proteins and rRNA, but the endoplasmic reticulum and the Golgi apparatus are also involved in protein glycosylation, storage, and transport.


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Biology and Geology teaching materials for Compulsory Secondary Education (ESO) and Baccalaureate students.