Energy and Life

Which one would you choose?

What is the currency of the cell?

• Understand ‘valuable’ vs. ‘usable’• The energy currency of cells is…

Adenosine tri-phosphate. (ATP)

ATP – Energy molecule

• Energy is stored in the bonds.• ATP ADP (+ P) and energy

ATP/ADP – Rechargeable battery

ATP – Fully Charged Battery ADP – Partially Charged Battery

Electron Carriers/CoenzymesNAD and FAD

…Act as a shuttle……Are constantly being reduced and oxidized…Reduced – gain electron(s)Oxidized – lose electron(s)In addition to the enzymes the cell needs, there are two

coenzymes used in cellular respiration. They are:Nicotinamide adenine dinucleotide (NAD+)Flavine adenine dinucleotide (FAD)

When reduced, NAD+ becomes…

…NADH (high energy molecule)

When oxidized, NADH becomes……NAD+

When reduced, FAD becomes…

…FADH2 (high energy molecule)

When oxidized, FADH2 becomes…

…FADReduced coenzymes (FADH2 and NADH) are used

to convert ADP ATP. (They are good.)