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B3 Biological molecules - Coggle Diagram
B3 Biological molecules
Most of the molecules in living organisms fall into three categories: carbohydrates, proteins and lipids
These all contain carbon and so are described as organic molecules
Carbohydrates
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Made of carbon, oxygen and hyrdoxide
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When lots of glucose molecules join together starch, glycogen or cellulose can form (a polysaccharide)
Proteins
Made of carbon, oxygen, hydrogen, and nitrogen and some contain small amounts of other elements such as sulphur
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There are about 20 different amino acids. They all contain the same basic structure but the ‘R’ group is different for each one
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The amino acids can be arranged in any order, resulting in hundreds of thousands of different proteins
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Lipids
Made of carbon, oxygen and hydrogen
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