We study cellular respiration because it is one of the most important pathways in biology. In fact,

nearly all carbohydrates at some point in their catabolism are directed through cellular respiration.
Why is it NOT necessary to have multiple independent pathways to break down different molecules?



a. Using cellular respiration is theoretically the most efficient way to break down sugars and
other molecules.
b. Oxygen must be used in the breakdown of all molecules in order to yield ATP.
c. Greater complexity would lead to an eventual failure of the biological system.
d. Most biological cells only catabolize one or two different types of sugars and only need
one main pathway.
e. The molecules that are degraded are all structurally similar and relatively easily
interconverted.


E

Biology & Microbiology

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