Take out your homework and work from yesterday

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?

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

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

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

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

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

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

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

Kreb’s Cycle (Citric Acid Cycle)

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

Just ONE ATP molecule. Not enough to live on

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

NAD+ vs NADH

NAD+ This is the vitamin Niacin Vitamin B3

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

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?

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