sentence: Lipids are classified as simple and complex.
sentences_before: A 'lipid' is a type of molecule useful in biology. It is also oily or waxy. Fats are made from lipid molecules. Sources of lipid can be found in algae, seeds, meat, cheese, butter and fish. Lipids are long chains of carbon and hydrogen molecules.
sentences_after: Examples of complex molecules could be steroids or phospholipids.
concept_name: lipid
headings: Lipid
categories: Biochemistry