The fate of the candy bar How do you think

these candy bars turn into energy?

Do you remember what organelle is responsible for changing food energy into chemical energy in ALL cells?

Cellular Respiration – 2 types

1. Anaerobic (without oxygen)     a) Glycolysis      b) Fermentation

2. Aerobic (with oxygen)      a) Kreb's cycle       b) Electron transport system

1. Anaerobic (without oxygen)   a) Glycolysis

Sugar is broken downTakes place in cytoplasm in the cellInput:

1 glucose (6 carbon molecule)2 ATP(NAD+)

Output: 2 pyruvates (3 carbon molecules)4 ATP - Net gain of 2 ATP’sNADH

   b) Fermentation (still in cytoplasm!)

Input: Pyruvates

Output:Ethyl alcohol or lactic acidCO2

NAD+ (can now be used in Glycolysis again!)

ExamplesYeast in bakingProduction of beer, wine, alcohol

2. Aerobic (with oxygen)

a) Kreb's cycle (aka Citric Acid Cycle)

Takes place in matrix of mitochondria

Input: 2 pyruvate

Output:4 CO2

2 ATPNADH and FADH2

b) Electron transport systemOccurs on cristae of mitochondriaAs electrons move, energy is given offProduces most ATP!Input:

O2

Output:H20

32 ATP!Including Glycolysis and Kreb’s cycle

36 ATP’s Produced!

Glycolysis

FermentationKreb’s Cycle

Electron Transport System

w/out Oxygenw/ Oxygen

Where does this all happen?

Glycolysis _____________ Krebs Cycle ___________ Electron Transport Chain ___________ Fermentation ___________

How many net ATP are made?

Glycolysis _____ Krebs ____ ETC ____ Fermentation ____

Photosynthesis Cell RespirationWhere? Chloroplasts Mitochondria

When? Presence of light All the time

Input CO2 & H20 Glucose & O2

Output Glucose & O2 CO2 & H20

Energy Source

Light Chemical bonds

Energy Result

Energy stored Energy released

Animal or Plant

Plants only Both!