The - The fall of electrons during respiration is stepwise,...

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

View Full Document Right Arrow Icon
The “fall” of electrons during respiration is stepwise, via NAD + and an electron transport chain. Cellular respiration does not oxidize glucose in a single step that transfers all the hydrogen  in the fuel to oxygen at one time. Rather, glucose and other fuels are broken down in a series of steps, each catalyzed by a  specific enzyme. At key steps, electrons are stripped from the glucose. In many oxidation reactions, the electron is transferred with a proton, as a hydrogen atom. The hydrogen atoms are not transferred directly to oxygen but are passed first to a coenzyme  called  NAD +  (nicotinamide adenine dinucleotide). How does NAD +  trap electrons from glucose? Dehydrogenase enzymes strip two hydrogen atoms from the fuel (e.g., glucose), oxidizing it. The enzyme passes two electrons and one proton to NAD + . The other proton is released as H
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/04/2012 for the course BSC BSC1005 taught by Professor Orlando,rebecca during the Fall '10 term at Broward College.

Ask a homework question - tutors are online