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GCSE Combined Science · key term
An organic molecule containing carbon, hydrogen and oxygen. Carbohydrates include simple sugars and larger molecules such as starch.
Used by OCR
Specification B1.3d · Biology Paper 1
Revise: Sugars and Carbohydrate MetabolismCarbohydrates are molecules containing carbon, hydrogen and oxygen. They include small, simple sugars, such as glucose, as well as much larger molecules, such as starch. So ‘carbohydrate’ does not just mean starch: sugars are carbohydrates too.
Biology, Combined Science
A biological molecule such as a sugar, starch or cellulose. Complex carbohydrates are built from sugar molecules.
When explaining importance, link sugars to both building larger carbohydrates and being released when those carbohydrates are broken down.
Not all carbohydrates are polymers: glucose is a simple sugar. Cellulose is a structural carbohydrate, not an energy-storage molecule.
Benedict’s reagent tests for reducing sugars such as glucose, not for every carbohydrate. Iodine tests specifically for starch.
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Three important groups are carbohydrates, lipids and proteins. Organisms need these molecules both as sources of fuel and as materials for building cells.
