Large biological molecules such as carbohydrates and proteins contain ________ bonds.

There are two types of bonds: ionic bonds and covalent bonds. In the ionic bond, one species donates the electrons, while the other gains them. In the case of covalent bonds, the electrons are shared among bonding species. Covalent bonds are the bonds that are present in many large biomolecules such as carbohydrates and proteins.

There are four main biomolecules: carbohydrates, proteins, nucleic acids and lipids. Carbohydrates are made up of monomer units called as monosaccharides. The specific type of covalent bond that connects two sugar molecules together is known as glycosidic linkage. For example, sucrose (common sugar) is made up of two sugar molecules - glucose and fructose, connected together by a glycosidic linkage. Similarly, in the case of proteins, amino acids are connected together by specific types of covalent bonds, known as peptide bonds.

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