Ch. 7-Cellular Respiration.pptx - Cellular Respiration and...

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Cellular Respiration and Fermentation Reading Assignment: Ch. 7
Explain how Catabolic pathways yield energy (Fermentation, & Cellular Respiration) Identify the stages of cellular respiration (Glycolysis, citric acid cycle, oxidative phosphorylation) Distinguish between the two phases of oxidative phosphorylation: the electron transport chain and chemiosmosis. Compare aerobic respiration and fermentation. Objectives
Overview: How cells get energy to do work Energy is stored in the chemical bonds between the atoms of complex organic compounds (food) Organism processes food, into simpler molecules to release energy. Enzymes catalyze the systematic degradation of complex organic molecules (food) that are rich in energy to simpler waste products that have less energy
Catabolic pathways yield energy by oxidizing organic fuels Concept 1 Catabolic metabolic pathways release energy stored in chemical bonds of complex organic molecules Organic compounds possess potential energy as a result of the arrangement of electrons in the bonds between their atoms Electron transfer plays a major role in these pathways.
Although carbohydrates, fats, and proteins are all consumed as fuel, it is helpful to trace cellular respiration with the sugar glucose C 6 H 12 O 6 + 6 O 2 6 CO 2 + 6 H 2 O + Energy (ATP + heat) The breakdown of glucose is exergonic. Fuel for Catabolic pathway
Catabolic Pathways and Production of Energy in the form of ATP Fermentation is a partial break down of sugars that occurs without O 2 Cellular Respiration: 1- Aerobic respiration consumes organic molecules and O 2 and yields ATP 2- Anaerobic respiration is similar to aerobic respiration but consumes compounds other than O 2 such as Sulfur or Nitrogen
Oxidation & Reduction O xidation I s L oosing electron- OIL R eduction I s G aining electron- RIG Nicotinamide adenine dinucleotide - NAD + NADH (Reduced, can donate electron) NAD (Oxidizing Agent) + Flavin adenine dinucleotide - FAD FADH 2 (Reduced, can donate electron) FAD In Biologist World … Hydrogen bonds with Electro Negative Elements such as C, N, O, P and S and give electron - Oxidation is Loosing Hydrogen Atom - Reduction is Gaining Hydrogen Atom
Oxidation of Glucose during Cellular Respiration During cellular respiration, glucose is oxidized, and O 2 is reduced becomes oxidized becomes reduced Oxygen has gain 12 electron in the form of H Carbon has lost 12 electron in the form of H
Step wise Oxidation of Glucose during Cellular Respiration
The Stages of Cellular Respiration: Harvesting of energy from glucose has three stages Glycolysis (breaks down glucose into two molecules of pyruvate) The citric acid cycle (completes the breakdown of glucose) Oxidative phosphorylation (accounts for most of the ATP synthesis)
Glycolysis (color-coded teal throughout the chapter) 1.

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