Biology ETC Help!

Pre-College Issues High School Life
1

<p>Alright, so we are studying the process of cellular respiration in class. My teacher gave us an assignment were we have to create a depiction of the pathway the electrons take during cellular respiration, beginning with glucose and ending with water. Seems easy enough but, there isn't alot of information on the role of electrons during cellular respiration. This is what I have so far can anyone help:</p>

<p>-Glucose releases 2 electrons which are picked up by NAD (changed to NADH + H+). This NAD moves to the Electron Transport Chain (assuming O2 is present, as otherwise they would move Fermentation). </p>

<p>-When broken down in Kreb's Cycle, Pyruvate releases 8 electrons (4 each) which are picked up by 6 NAD and 2 FAD (again they change to add the -H + H+).</p>

<p>This is now where I start to get confused. So the NADH + H+ and FADH + H+ drop of their electrons at the different I believe they are called proteins present in the ETC (NADH Dehydrogenase, Cytochrome Reductase, and Cytochrome Oxilase). Now I am somewhat lost. THe electrons help diffuse H+ up the proteins (I understand what the H+ does and how it needs a higher concentration on top etc. so no need to go into depth on that), but what else to the electrons do in the ETC?</p>

<p>Thanks alot for the help!</p>

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<p>The electrons move down from protein to protein, and in the end they combine with the H+'s and an O2 molecule to make water, which is expelled as a waste product. </p>

<p>Their main function is to provide the energy to pump H+ across the cristae membrane.</p>

3

<p>-WRONG</p>

<p>Glucose doesn't have 2 electrons pickedu up by NAD, remember Glucose turns into Pyruvate which then turns into Acetyl-coA and then gets send in carbon fixation and phosphorylation in the krebs cycle</p>

<p>Anyways, the part you're confused on is simple/
The electrons travel through the "chain" of proteins causing an action potential of H+ ions to later be picked up by ATP synthase. As u know, diffusion is High-to-low concentration.
The electrons are basically the main production of the potential.
Without them u can't have the ETS</p>

<p>Anyways, I think you can't ask for homework help on CC....</p>

<p>Hope that clears up some confusion</p>

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<p>ahhhhhhh too much bio. X0</p>