LS_2_Lec_5_Energy

LS_2_Lec_5_Energy - Life Sciences 2 Cellular Pathway &...

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Life Sciences 2 Energy Chapter 9 Dr. Joseph Esdin Where Do Living Organisms Get Their Energy From? • Autotrophs – Use solar energy to synthesize food compounds • Heterotrophs – Obtain energy by processing the chemical energy in organic compound
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Where Do Cells Get Their Energy From? • Cells obtain energy by processing the chemical energy in organic compound – Cellular respiration • Food can be carbohydrates, proteins, or lipids Cristae Cristae Intermembrane space Proteins of electron transport chain Inner membrane Matrix Outer Membrane Respiration
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• C 6 H 12 O 6 + 6 O 2 6 CO 2 + 6 H 2 O + energy • Two major pathways – Aerobic – Anaerobic ATP Adenine Phosphate groups Ribose High energy bonds
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ATP Use • Exergonic reactions produce ATP • ATP hydrolysis is used to power endergonic reactions in the cell ATP Hydrolysis P P P P P P + + H 2 O i Adenosine triphosphate (ATP) Adenosine diphosphate (ADP) Inorganic phosphate Energy
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ATP Use Exergonic reaction: Endergonic reaction: Active transport Cell movement anabolism Energy used Energy released ATP Use • Chemical - • Transport - • Mechanical -
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Energy and Electrons from Glucose • Different metabolic processes are used in the breakdown of glucose for energy – Glycolysis followed by cellular respiration – Glycolysis followed by fermentation Redox Reactions Reduced compound A Oxidized compound A Reduced compound B Oxidized compound B
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Nicotinamide Adenine Dinucleotide Nicotineamide Adenine Dinucleotide Oxidation Reduction Oxidation Reduction
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Redox Reactions becomes oxidized becomes reduced Glucose • Glucose breakdown leads to ATP formation
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This note was uploaded on 08/15/2011 for the course LS 2 taught by Professor Pires during the Spring '08 term at UCLA.

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LS_2_Lec_5_Energy - Life Sciences 2 Cellular Pathway &...

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