Exam 2 L1 - Movement of Energy

Exam 2 L1 - Movement of Energy - How Cells Use Energy...

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How Cells Use Energy - Chloroplast: energy is first captured and stored as glucose - Mitochondrion: where cells break down glucose and make ATP (The 2 nd law of thermodynamics – the natural tendency to lose energy (to heat) over time – helps explain the concept of energy capture and release…) Photosynthesis is an endergonic (energy-in) reaction Respiration is an exergonic (energy-out) reaction (generally speaking, the word “respiration” refers to the metabolic pathway that occurs in the mitochondrion, where glucose is made into ATP) Energy Capture Where exactly is the energy that we’re going to extract? …it is contained in the electrons in the chemical bonds of glucose - The goal: to harvest the energy in those electrons Energy extraction occurs in a series of steps: - Oxidation-Reduction: movement of electrons from one molecule to another - Oxidation: loss of electrons - Reduction: gain of electrons (think of it as a ‘gain of a negative charge’…thus: “reduction”) - “Redox”: both occurring together in a series
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This note was uploaded on 02/08/2011 for the course BIO 101 taught by Professor Cantwell during the Fall '08 term at University of Tennessee.

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Exam 2 L1 - Movement of Energy - How Cells Use Energy...

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