Lesson 6 - Cellular Respiration.docx - Lesson 6 u2013...

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Lesson 6 – Cellular Respiration Introduction In this lesson, you will learn how the process of cellular respiration turns food into useable energy for the cell. What You Will Learn After this lesson, you will be able to: o Describe, compare, and illustrate (for example, using flow charts) the matter and energy transformations that occur during the process of aerobic and anaerobic cellular respiration, with specific reference to the role of mitochondria. o Use appropriate terminology to explain the major concepts related to cellular respiration. o Explain the chemical changes and energy conversions associated with the processes of aerobic and anaerobic cellular respiration. o Use the laws of thermodynamics to explain the transfer of energy in the cell during the process of cellular respiration. o Conduct a laboratory investigation in the process of cellular respiration to identify the products of the process, interpret the qualitative observations, and display these observations in an appropriate format. o Identify and describe careers related to the field of cellular respiration, and describe contributions of scientists, including Canadian scientists, to that field. Aerobic Cellular Respiration Aerobic cellular respiration is the process of capturing the energy of the electrons that are shared in the covalent bonds ( C H ) of glucose, using oxygen as a final electron acceptor. o The process results in the release of energy and the formation of water and carbon dioxide as products: C 6 H 12 O 6 + 60 2 6 CO 2 + 6 H 2 O + energy This process can be broken down into four main stages: 1. Glycolysis 2. Pyruvate oxidation 3. Krebs cycle 4. Electron transplant chain/chemiosmosis
Respiration uses energy-carrying coenzymes, enzymes and specialized structures within the mitochondria to incrementally extract the energy of the electrons as they move toward their final electron acceptor, oxygen. o This catabolic, exothermic process follows the laws of thermodynamics. o It generates free energy in ATP and loses energy as waste heat during every reaction. The electrons are stripped from glucose have a lot of potential energy. o As they move through the electron transport chain via redox reactions, the electrons lose some energy in order to drive the proton pumps, and even more is lost as heat (disorder). You can think of the electrons as being at the top of a flight of stairs and that at every stage of the respiration process, they move down the staircase, converting their potential energy to useable energy with every step. Structures Involved in Cellular Respiration This is review of the cellular structures and molecules involved in aerobic cellular respiration. The Mitochondrion Eukaryotic animal and plant cells are filled with cytoplasm.

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