BIO311C_F08_chapter 9 - Cellular Respiration Chapter 9

Info iconThis preview shows pages 1–11. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Cellular Respiration Chapter 9 http://science.nhmccd.edu/biol/bio1int.htm Life: the science of biology (Purves et al) The Principle of Redox Transfer electrons from one reactant to another by oxidation and reduction Oxidation and Reduction occur together - coupled reactions Some redox reactions Change the degree of electron sharing in covalent bonds Electrons move from less to more electronegative atom lose potential energy harvested for work CH 4 H H H H C O O O O O C H H Methane (reducing agent) Oxygen (oxidizing agent) Carbon dioxide Water + 2O 2 CO 2 + Energy + 2 H 2 O becomes oxidized becomes reduced Reactants Products Cellular Respiration Cellular Respiration A catabolic, exergonic, oxygen (O catabolic, exergonic, oxygen (O 2 ) ) requiring process that uses energy energy extracted from macromolecules (glucose) macromolecules (glucose) to produce energy energy (ATP) (ATP) and water (H water (H 2 O). O). C 6 H 12 O 6 + 6O 2 6CO 2 + 6H 2 O + energy glucose glucose ATP Fig. 9-4 Dehydrogenase Reduction of NAD + Oxidation of NADH 2 e + 2 H + 2 e + H + NAD + + 2[ H ] NADH + H + H + Nicotinamide (oxidized form) Nicotinamide (reduced form) Electrons from organic compounds first transferred to NAD+, a coenzyme Examples of oxidizing/reducing agents (H/e- carriers) Oxidizing agent: FAD (Flavin adenine dinucleotide) NAD + (nicotinamide adenine dinucleotide) NADP + (NAD phosphate) Reducing agent: FADH2 NADH + H + NADPH + H + If electron transfer is not stepwise A large release of energy occurs As in the reaction of hydrogen and oxygen to form water (a) Uncontrolled reaction Free energy, G H 2 O Explosive release of heat and light energy Figure 9.5 A H 2 + 1 / 2 O 2 2 H 1 / 2 O 2 (from food via NADH) 2 H + + 2 e 2 H + 2 e H 2 O 1 / 2 O 2 Controlled release of energy for synthesis of ATP ATP ATP ATP E l e c t r o n t r a n s p o r t c h a i n Free energy, G (b) Cellular respiration + Figure 9.5 B Fig. 9-6-3 Mitochondrion Substrate-level phosphorylation ATP Cytosol Glucose Pyruvate Glycolysis Electrons carried via NADH Substrate-level phosphorylation ATP Electrons carried via NADH and FADH 2 Oxidative phosphorylation ATP Citric acid cycle Oxidative phosphorylation: electron transport and chemiosmosis...
View Full Document

Page1 / 40

BIO311C_F08_chapter 9 - Cellular Respiration Chapter 9

This preview shows document pages 1 - 11. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online