Free glycans consist of monosaccharide residues and are not part of complex carbohydrates. Examples are free oligosaccharides and polysaccharides. Glycoproteins and glycolipids, which are complex carbohydrates, are structures in which glycan moieties and aglycone are bonded.
Lipid is a molecule existing in organisms having long chain fatty acids or hydrocarbon chains or derived from organisms.
Disease is a state in which something bad or inconvenient has occurred in the heart and body of humans and animals.