calvinthebarber
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The AQA textbook for Biology states that:

The proportion of oxygen to carbon and hydrogen is smaller in lipids than in carbohydrates.
I was wondering if anyone could tell me why this is important?

Thanks,

Calvin
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acciolucy
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I believe that it means you get more energy per gram with lipids than carbohydrates
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Dynamo123
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(Original post by calvinthebarber)
The AQA textbook for Biology states that:



I was wondering if anyone could tell me why this is important?

Thanks,

Calvin
Well, it actually means that lipids store nearly double the amount of energy compared to carbs. In carbs, oxygen is present in the ratio found on water i.e. with 2H there is one O atom (note: this is not actually true. But at your level, it will suffice). In lipids, however, the ratio is not 2:1, but greater i.e. more H atoms are present relative to the O atoms. This, along with the presence of C=C double bonds, is one reason why lipids are insoluble in water. It ahs nothing to do with the energy, that is dependant on the proportion of CH bonds.
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