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12 Dec 2019

In regards to the three main energy cycles in bioenergetics Why does the body prefer not to use protein as a main fuel source?

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Patrina Schowalter
Patrina SchowalterLv2
13 Dec 2019
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Use the following article to answer these questions:

http://www.nature.com/scitable/topicpage/nutrient-utilization-in-humans-metabolism-pathways-14234029

1)This article points out that a major misconception, especially for many undergraduates, is that human cells only use glucose as a fuel source. In fact, all three major absorbed end products of the digestion of carbohydrates, lipids and proteins can be utilized by most cells for the generation of ATP. What serves as the major entry point (mechanism) for these different classes of molecules that makes it possible for them to serve as fuel for ATP production? Why does this mechanism not work in the absence of oxygen? Hint: consider glycolysis and fermentation.

2)Although many of the approximately 200 cell types in the human body can utilize all three major classes of food molecules for energy, not all can. Why? Provide an example.

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