Chapter 9 HO

Lotsa fuel incellularrespira0on

Info iconThis preview shows page 1. Sign up to view the full content.

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

Unformatted text preview: eases energy that can be used to preform work! Respira0on:(!Oxida8on!of!glucose!and!other!molecules!in!food! Become!Oxidized! CATABOLIC REACTION!!! Glucose is oxidized (reducing agent) - donates eand becomes CO2 C6H12O6&&&&&&&&+&&&&&&&&6O2&&&&&&&&&&&&&&&&6CO2&&&&&&+&&&&&6H2O! Free&Energy& Become!Reduced! C6H12O6& +& 6O2& Electrons!fall! down!energy! gradient! Oxygen is reduced (oxidizing agent) and accepts the e- 6CO2& 6H2O& ΔG&=&T689&kcal/mol& Key(Point:((Organic!molecules!that!have!an!abundance!of!hydrogens!are!excellent!fuels!because! their!bonds!are!a!source!of!“hilltop”!electrons!(can!easily!give!up!electrons)! ! *! Energy is released when the "hilltop" electrons "fall" down an energy gradient when they are TRANSFERRED TO OXYGEN. Lotsa fuel. In(cellular(respira0on:( The!oxida8on!of!glucose!transfers!electrons!to!a!lower!energy!state!which!liberates!energy! Free&Energy& The!energy!is!used!to!synthesize!ATP!! C6H12O6& +& 6O2& EA! Enzymes( Electrons!fall! down!energy! gradient! 6CO2& 6H2O& Energy& Cellular!respira8on!does(not(oxidize!glucose!in!one!single!explosive!step! *! Glucose and organic fuels are broken down in a SERIES of steps - cascade? Each!step!is!catalyzed!by!an!enzyme! At!each!key!step,!electrons!are!stripped!from!glucose! *! Each electron (e-) travels with a proton (H+) H atom Oxidized!! ΔG&=&T689&kcal/mol& Review:((Structure(of(Glucose( Why(is(glucose(such(an(important(organic(fuel?( ! ! ! Glucose molecules contain many "hilltop" electrons that are transferred to electron carriers during the complete oxidation of glucose to CO2 Hydrogen(atoms(are(not(transferred(directly(to(oxygen(–(first(transferred(to(an(electron(carrier(( Requires dehydrogenase (enzyme!) Become!Oxidized! Part!of!! Glucose! !!!!!!!!!|!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!|!!!!! Dehydrogenase(( +!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!C!=O!!!!!+!!!!!NADH!!!!+!!!!H+! H!—!C!—!OH!!!!!+!!!NAD !!!!!!!!!!!!!|!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!|! 2!e8,!1!p! 1!p! 2!e8,!2!p! Become!Reduced! Electron!Ca...
View Full Document

This document was uploaded on 02/04/2014.

Ask a homework question - tutors are online