Notes: Cellular Respiration Finish Bioenergetics Foldable Day 33 Notes: Cellular Respiration Finish Bioenergetics Foldable

Bell Ringer: Day 33 Sketch each graph and explain what it shows: photosynthesis Rate of photosynthesis Rate of Temperature Light intensity Finish this graph Sketch what you think this graph should look like. photosynthesis Rate of photosynthesis Rate of Amount of water CO2 concentration

Cellular Respiration: Breaking down glucose to form usable energy (ATP)

Mitochondria

Cellular Respiration Happens in both plant and animal cells in the mitochondria Overall Reaction: C6H12O6 + 6O2 → 6CO2 + 6H2O (+ATP)

Cellular Respiration Overview What type depends on whether or not there is oxygen Aero = oxygen Aerobic Respiration – makes the most energy Anaerobic Respiration – “Fermentation” makes less energy, doesn’t use mitochondria

Step 1: Glycolysis Glycolysis breaks glucose apart into 2 molecules makes 2 molecules of ATP (energy) and makes NADH which carries high energy electrons happens in the cytoplasm of the cell

Step 2: Check for Oxygen If oxygen is present, the cell can make more ATP by aerobic respiration If no oxygen is present, the cell has to recycle the pieces from glycolysis by fermentation

Step 3 with oxygen: Cellular Respiration Oxygen required=aerobic 2 more sets of reactions which occur the cell’s mitochondria 1. Kreb’s Cycle (citric acid cycle) – makes 2 ATP plus NADH and FADH2 which carry high energy electrons 2. Electron Transport Chain – makes 32-34 ATP

Kreb’s Cycle (Citric Acid Cycle)

Electron Transport Chain

Step 3 without oxygen: Fermentation The cell must recycle the materials from glycolysis. This recycling process is called fermentation. Produces NO MORE ATP Happens in the cytoplasm

2 types of fermentation Lactic acid fermentation: done by some bacteria and in animal muscles. produces lactic acid this is what makes your muscles sore if you work out really hard Alcoholic fermentation: done by yeast produces ethanol and CO2 this is why bread rises

Energy Tally 36 ATP for aerobic vs. 2 ATP for anaerobic Glycolysis 2 ATP Kreb’s 2 ATP Electron Transport 32 ATP 36 ATP Anaerobic organisms can’t be too energetic but are important for global recycling of carbon