2. Take out your homework and work from yesterday

3. 6O 2 + C 6 H 12 O 6 -> 6CO 2 + 6H 2 O + energy Oxygen + glucose -> carbon dioxide + water + energy What does this REALLY mean?

4. Where does the oxygen come from? The “glucose” What happens to the carbon dioxide? The water? What ‘energy’?

5. Kreb’s Cycle (Citric Acid Cycle) Regulated by many different enzymes!

6. Kreb’s Cycle (Citric Acid Cycle) Regulated by many different enzymes Occurs in mitochondrial matrix Why 2 membranes?

7. Kreb’s Cycle (Citric Acid Cycle) Regulated by many different enzymes Occurs in mitochondrial matrix A two-carbon compound attached to a co- enzyme enters The carrier/co-enzyme is Coenzyme A Basically a nucleic acid with vitamin B5 attached CoA

8. Kreb’s Cycle (Citric Acid Cycle) Coenzyme A (CoA)

9. Kreb’s Cycle (Citric Acid Cycle) When the two-carbon compound is attached It’s called acetyl-CoA

11. Kreb’s Cycle (Citric Acid Cycle) The Kreb’s Cycle needs the two-carbon compound The coenzyme isn’t a reactant, it’s a carrier Since it’s a cycle, it ‘begins’ and ‘ends’ at the same spot

12. Kreb’s Cycle (Citric Acid Cycle)

14. How do you go from NAD+ to NADH? And FAD to FADH 2 ? Vitamin B12!

15. Just ONE ATP molecule. Not enough to live on

16. Kreb’s Cycle (Citric Acid Cycle) NAD+ Nicotinomide Adenine Dinucleotide

17. NAD+ vs NADH

19. NAD+ This is the vitamin Niacin Vitamin B3

20. Kreb’s Cycle (Citric Acid Cycle) Remember, this… Happens here

21. Kreb’s Cycle (Citric Acid Cycle) 1.So what really IS “food”? 2.Why is ‘food’ carbon based? Why not oxygen, or fluorine, or chlorine, etc. 3.Where does the CO 2 you breath out come from?

22. Homework READ page 256