Ch 26 Aerobic respiration Flashcards
What is the final electron acceptor in aerobic respiration
Oxygen; so electrons don’t run around as free radicals
Most of ATP is made where?
Mitochondria
Stages of cellular respiration
- Glycolysis (2ATP 2 NADH 2 Pyruvate)
- Pre-kreb’s prep cycle
- Krebs cycle
- Electron transport chain
- Chemiosmosis with ATP synthase
What happens in stage two: pre-Krebs cycle? And loses what via what?
-Pyruvate (3C) —>acetyl CoA (2C) via coenzyme A (loss of carbon atom by carbon dioxide)
Purpose of stage two pre-Krebs cycle?
-Preps carbon molecule for Krebs cycle
-passes pyruvate into mitochondrial matrix
End products of stage two pre-Krebs cycle?
2 NADH
2 CO2
2 acetyl CoA
What happens in stage three Krebs cycle or citric acid cycle?
Acetyl-CoA —> citric acid
 then cycle continues in the ring
Purpose of stage three Krebs cycle:
Use the Carbon to generate more NADH & FADH2 , Some CO2 byproduct
Net yield of stages 2and 3 of cellular respiration:
6 CO2
2 ATP
8 NADH
2 FADH2
How many times do mitochondrial matrix reactions occur?
Twice: because of 2 acetyl Co-A’s
What happens in Stage 4: electron transport chain
Electron carriers deliver electrons which move along protein complexes in inner membrane of mitochondria. Electrons picked up by oxygen which makes water.
Purpose of stage 4: electron transport chain
-Creates electron gradient: high H+ in inter-membrane
-regenerate NAD+ and FAD (Oxidize NADH and FADH2)
What happens in Stage five: Chemiosmosis?
Protons move down electrochemical gradient across membrane at ATP synthase pump which creates ATP
ATP synthase pump requires how many H+ for each ATP?
Requires 3H+ for each ATP
NAD+ releases at which enzyme complex? How many ATP are generated by NADH?
Complex 1; 2.5 ATP
