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Complicated question.

It's somewhat dependent on the available food. In a perfect world (ie: one where every type of nutrient is available in abundance), our bodies prefer glucose, as do most fauna.

Plants are a little different -- they don't "break down" in the way you're thinking, although they do use carbon dioxide in the air and water from the ground to produce ATP, as well as glucose, which we use as an energy source. Think of plants and animals as inversions of each other -- we break down glucose and put out carbon dioxide, and they break down carbon dioxide and put out glucose.

We can also burn practically anything for energy to make ATP. Energy from the breaking of chemical bonds is used (to create the MOST ATP, but this isn't the only way to make it) to create an electrical charge across a membrane to drive the formation of ATP. This can include the breakdown of protein and fats, as well as carbohydrates (simple and complex sugars) that aren't glucose.

My authority? University student at The University of Western Ontario (London, ON, Canada), honours specialization in cell & developmental Biology and major in genetics.

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14y ago
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10y ago

The monosaccharide glucose, which is not a macromolecule, is most commonly broken down to make ATP in the process of cellular respiration. However, starch (in plants) and glycogen (animal starch) macromolecules are composed of millions of glucose molecules bonded together, and when the cells start to run out of glucose molecules, the starch or glycogen is broken down to release more glucose molecules that can then be broken down to make more ATP.

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Q: Which are most often broken down to make ATP?
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