The oxidation of nutrient molecules (glucose, triglyceride, etc) to CO2 and H2O produces the same internal energy change, enthalpy change, or free energy change whether by combustion in the laboratory or through the metabolic pathway.
An important related proposition is that enzymes accelerate the rate of a chemical reaction but do not change the position of equilibrium. A catalyst can change the reaction pathway but not the overall thermodynamics. While the kinetics of a reaction depend on the path, the chemical thermodynamics do not.
Almost every MCAT will have some question to see if you can comfortably separate kinetic (path dependent) reasoning from thermodynamic (path independent) reasoning.
The WikiPremed MCAT Course is a comprehensive course in the undergraduate level general sciences. Undergraduate level physics, chemistry, organic chemistry and biology are presented by this course as a unified whole within a spiraling curriculum. Please read our policies on Privacy and Shipping & Returns. Contact Us. MCAT is a registered trademark of the Association of American Medical Colleges, which does not endorse the WikiPremed Course. WikiPremed offers the customers of our publications or our teaching services no guarantees regarding eventual performance on the MCAT.
WikiPremed is a trademark of Wisebridge Learning Systems LLC. The work of WikiPremed is published under a Creative Commons Attribution NonCommercial ShareAlike License. There are elements of work here, such as a subset of the images in the archive from WikiPedia, that originated as GNU General Public License works, so take care to follow the unique stipulations of that license in printed reproductions.