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Hydroxyl group (-OH), The hydroxyl group of a substance, such as an alcohol, and the hemiacetal or hemiketal group of a saccharide (or a molecule produced from a saccharide), form a glycosidic link.

More about Hydroxyl group:

An oxygen atom with two lone pairs attached to a hydrogen atom is the basic building block of hydroxyl groups. They easily engage in hydrogen bonding, producing an ion that is net either positively or negatively charged.  Additionally, members of this group can take part in chemical processes that join molecules together to produce chains of sugars or fatty acids.

A functional group is one that contains the hydroxyl group (-OH). Alcohols are the molecules that are created when hydroxyl groups are the main functional group attached to carbon backbones.

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