Cell Energy: Cellular Respiration

Cell Energy: Cellular Respiration

Cell Energy: Cellular Respiration Cellular Respiration Overview Electrons Electrons Electrons Glycolysis Glucose Pyruvate Krebs Cycle

[Matrix] Mitochondria Electron Transport Chain (ETC) [Inner membrane] sm a l p o Cyt 34 ATP 2 ATP

2 ATP Image modified fromCampbell Biology: Concepts and Connections, 5th ed. (Online textbook). Retrieved 30 March 2010 from: http://media.pearsoncmg.com/bc/bc_campbell_concepts_5/media/art/ch6/ir/imagelib_tab_1/14.htm Comparing photosynthesis and cell The energy flow in these reactions take place in opposite respiration directions The equation for photosynthesis and cellular respiration are the reverse of each other Photosynthesis

releases oxygen and cellular respiration uses the oxygen to release the energy in food Photosynthesis uses carbon dioxide and cellular respiration replaces it. Photosynthesis: Cellular Chloroplast Respiration: Mitochondria

Draw in your notes Cellular respiration overview Goal: Convert food (C6H12O6) into energy ATP Overall Reaction: C6H12O6 In + 6 02 6 CO2 +6 H20 + ENERGY (ATP)

the presence of oxygen: Aerobic- 34-38 ATP Glycolysis Krebs cycle ETC Without oxygen- Anaerobic- 2 ATP Glycolysis Fermentation: Alcoholic and Lactic Acid

Big Picture GLUCOSE Glycolysis Not a lot of ATP made Then With oxygen Without oxygen Aerobic Fermentation Respiration

Alcoholic Lactic Acid Glycolysis- the first step in releasing Only a small amount of energy is released in this step (2 ATP) energy Happens Location: first whether oxygen is present or not In the cytoplasm of the cell Reactants: (not yet in the mitochondria)

Glucose Products: 2 Pyruvate 2 NADH (NAD+, Electrons, and Hydrogen) as an electron carrier 4 ATP are made 2 ATP are used = 2ATP

Cellular Respiration Overview Electrons Electrons Electrons Glycolysis Glucose Pyruvate Krebs Cycle [Matrix] Mitochondria

Electron Transport Chain (ETC) [Inner membrane] sm a l p o Cyt 34 ATP 2 ATP 2 ATP Image modified fromCampbell Biology: Concepts and Connections, 5th ed. (Online textbook). Retrieved 30 March 2010 from: http://media.pearsoncmg.com/bc/bc_campbell_concepts_5/media/art/ch6/ir/imagelib_tab_1/14.htm

In the presence of oxygen the cycle will continue into the mitochondria! Krebs Cycle Named after Hans Krebs- Also known as the Citric Acid Cycle Pyruvate is broken down into Carbon Dioxide in a series of energy extracting reactions Takes

place in the matrix or space in the mitochondria Reactants: Products: One Pyruvate (3 carbon sugar) and oxygen CO2, NADH, FADH2 (from FAD+), and 2 ATP carbon from the Pyruvate attaches to an O2 molecule: CO2 The remaining carbons go through a series of events to release

more CO2 and add electrons to NAD+ NADPH, and FAD+ FADH2 to fuel the next cycle Chemically, this is how it all goes down. Image taken from www.sp.uconn.edu Cellular Respiration Overview Electrons Electrons Electrons Glycolysis

Glucose Pyruvate Krebs Cycle [Matrix] Mitochondria Electron Transport Chain (ETC) [Inner membrane] sm a

l p o Cyt 34 ATP 2 ATP 2 ATP Image modified fromCampbell Biology: Concepts and Connections, 5th ed. (Online textbook). Retrieved 30 March 2010 from: http://media.pearsoncmg.com/bc/bc_campbell_concepts_5/media/art/ch6/ir/imagelib_tab_1/14.htm Electron Transport Chain (ETC) Takes place on the Cristae of the mitochondria

The electron carriers FADH2 and NADH take the high energy electrons from the Krebs Cycle to the electron transport chain to convert ADP into ATP As electrons are passed from carrier to carrier, the energy is used to pump hydrogen ions (H+) across the membrane of the mitochondria. This high concentration of H+ flow through a protein, ATP Synthase, to convert ADP into ATP

Forming Since 34 ATP oxygen is present, some of it will attach to the H+ Cellular Respiration Overview Electrons Electrons Electrons Glycolysis Glucose

Pyruvate Krebs Cycle [Matrix] Mitochondria Electron Transport Chain (ETC) [Inner membrane] sm a l p

o Cyt 34 ATP 2 ATP 2 ATP Image modified fromCampbell Biology: Concepts and Connections, 5th ed. (Online textbook). Retrieved 30 March 2010 from: http://media.pearsoncmg.com/bc/bc_campbell_concepts_5/media/art/ch6/ir/imagelib_tab_1/14.htm What if after glycolysis, there is NO oxygen???? Anaerobic conditions lead to . . . Fermentation 1.

2. Lactic Alcoholic Acid after ***No more ATP produced Summary Photosynthesis and Cellular Respiration Cycle Products of one become reactants of the other!

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