Lecture 13 Flashcards
1
Q
Describe the role of NADH in glucose catabolism
A
NADH shuttle elections from glucose to electron transport chain for use in oxidative phosphorylation
2
Q
Describe redox reactions of cellular resperation
A
Glucose oxidized to CO2 and O2 is reduced to H2O
- electrons are passed from glucose to NAD+
- electron passed from NADH to oxygen at electron transport chain
- carbon of glucose is lost as CO2
3
Q
Describe (de)phosphorylation
A
ATP (in equilibrium with) ADP +Pi +energy
- transfer of phosphate from one molecule to another
- ATP production by this method is called substrate level phosphorylation
4
Q
What are the processes of aerobic cellular respiration?
A
- glycolysis
- pyruvate oxidation
- citric acid cycle
- oxidative phosphorylation
5
Q
Where are the different locations of the processes of aerobic cellular respiration
A
Glycolysis is in the cytosol
Everything else are in the mitochondrion in eukaryotes
6
Q
Describe pyruvate oxidation in eukaryotes
A
- pyruvate enters mitochondria via active transport
- Carboxyl group removed as CO2
- NAD+ reduced to NADH, two carbon fragment oxidized
- coenzyme A added to acetyl group, forms acetylCoA, has very high potential energy
7
Q
Electrons have more free energy in water or NADH
A
NADH, waters electronegativity stabilizes electrons
8
Q
What is glycolysis
A
“Sugar splitting”
- oxidizes glucose to 2 molecules of pyruvate
- H+ and electron from glucose reduce NAD+ to NADH
- ATP produced
