Ok, im going to break it down and just tell you the straight up facts with no interpretation, you can ask questions if you need.
My apologies for starting at square 1, but then i can refer to this for any more CR questions in a year or so
CR Step 1, Glycolysis
You begin with 1 glucose molecule. Now, there is an initial 'investment', if you will, of 2 ATP (Adenisine TriPhosphate, which can release energy when broken into ADP+P, then with an input of energy be reformed into ATP, hence the ATP Cycle). Using that energy, the Glucose is broken into half, giving 2 3-carbon molecules +P.
Then, electrons and hydrogen ions from those 3 carbon molecules are transferred to NAD+, making it NADH. The 3-carbon molecules are now 3 carbons+ 2P
Now, each of those can produce 2 ATP (net gain of 2) and glycolysis ends with 2 Pyruvic Acid molecules
Step 2 The Krebs Cycle
In the Krebs cycle, which starts with 1 Pyruvic acid (so it happens twice per glucose) most of the rest of the energy is taken out.
3 H2o are added to the PA, which then releases a CO2. NAD->NADH happens again, leacing acetyl coenzyme A (Acetyl CoA). the Acetyl CoA is then bonded with a 4 carbon acceptor molecule, and the end result of 1 Krebs cycle is:
- 2 Co2
- 1 ATP
- 1 FADH2
- 3 NADH
The 4 carbon receptor stays, and can be reused. This happens twice (so multiply the list x2) for each glucose.
Step 3 ETC and ATP Synthase
Energy carried in NADH is transferred into the ETC, where energy produced as iif flows down the ETC pulls H+ ions across and it is stored up (Dam analogy).
When the energy reaches the end, and has very little energy, it is bonded with water. The built up H+ ions flowing across the ATP Synthase provide the energy to create ATP from ADP+P. In all, ETC/ATPS create ~34 ATp
That makes the overall production of ATP:
- Glycolysis: Net of 2
- Krebs: 1+1=2
- ETC/ATPS: up to 34
So the total amount of ATP produced for 1 glucose can be as high as 38.
What do you need?
btw, pics are copyright 2004 Pearson Education