Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Krebs Cycle Steps
For each molecule, describe what happens to it during Krebs Cycle
| Question | Answer |
|---|---|
| Pyruvic Acid | Enters the Krebs Cycle. Loses it's Carboxyl group by donating a H+ to NAD+ and releasing CO2. A CoA group is added to the remaining Acetyl group forming Acetyl~CoA (2C). |
| Acetyl~CoA (2C) | The unstable CoA bond is broken - the Acetyle group joins Oxaloacetic acid (4C) to form one 6C compound: Citric Acid |
| Citric Acid (6C) | Citric Acid is converted to its isomer: Isocitric Acid by the removal and then addition of a H2O molecule. |
| Isocitric Acid (6C) | A Carboxyl group is lost by the release of CO2 and the reduction of NAD+ to NADH. a-Ketoglutaric acid remains (5C) |
| a-Ketoglutaric Acid (5C) | A H+ is donated to NAD+ and a CO2 is released. An unstable CoA bond is added making Succynyl~CoA (4C) |
| Succynyl~CoA (4C) | CoA is replaced by a Phosphate group which is then transferred to GDP+ and ultimately to ATP. The 4 Carbon Succinic Acid remains. |
| Succinic Acid (4C) | 2 H+ are transferred to FAD to form FAD2. Fumaric acid remains (4C). |
| Fumaric Acid (4C) | A H2O molecule is added, bonds are rearranged to form Malic Acid (4C) |
| Malic Acid (4C) | NAD+ is reduced to NADH leaving Oxaloacetic Acid (4C) |
| Oxaloacetic Acid (4C) | joins the Acetyl group of Acetyle~CoA while the CoA is lost forming Citric Acid. |
| How many ATPs are invested during Krebs Cycle? | None |
| How many NADH are produced per original molecule of glucose? | 6 |
| How many FADH2 are produced per glucose? | 2 |
| How many turns of the Krebs Cycle occur for every glucose that went through glycolysis? | 2 |
Created by:
BiologyBee
Popular Biology sets