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Proteins
Yes, CH3 (methyl group) is an organic functional group that is commonly found in organic molecules.
Coenzymes
A thiol
carbon. but then all organic molecules also have hydrogen and oxygen too.
Sterol
Nucleic acids
Thiols , organic molecules that contain the -SH group.
While both are organic molecules, glycerol has everything to do with lipids and proteins are in their 'own league'.
A group of atoms responsible for the characteristic behavior of the class of compounds in which the group occurs, as the hydroxyl group in alcohols.
Hydroxyl group
Algae