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Cellular Respiration

Cellular Respiration. Do Now ( Xtra credit – due in 5 minutes. Complete on a separate sheet of paper): 30 kJ of energy is released when 1 mol of ATP is broken down into ADP. 1 mol of glucose contains 2870 kJ of chemical energy.

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Cellular Respiration

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  1. Cellular Respiration Do Now (Xtra credit – due in 5 minutes. Complete on a separate sheet of paper): 30 kJ of energy is released when 1 mol of ATP is broken down into ADP. 1 mol of glucose contains 2870 kJ of chemical energy. If aerobic respiration produces 36 mol of ATP per mol of glucose, what % of the energy is a cell getting from the glucose it consumes?

  2. ATP = Energy • The phosphate-phosphate bond broken when ATP  ADP + Pi releases 30 kJ/mol of energy.

  3. Solution • 36 mol ATP x 30 kJ/mol = 1080 kJ • 1080 kJ / 2870 kJ = 38% • In other words, aerobic respiration is about 38% efficient at getting energy from glucose into a useable form.

  4. Responding to Your Concerns • Some updates to the course policies for the 2nd quarter and remainder of the year. 1. The weight of grade categories will be changed. Labs will be reduced from 25% to 20%, and quizzes will be increased from 15% to 20% 2. More labs (25-50%) will be completed on an individual basis.

  5. Cellular Respiration • Is a complex biochemical pathway that breaks down organic chemicals in order to make ATP.

  6. There are two main types of respiration • Aerobic respiration requires oxygen and produces lots of energy • Anaerobic respiration does not require oxygen, but produces little energy

  7. The products of glycolysis are used in two different ways

  8. Glycolysis: The 1st Step Glucose is split in half, which releases some energy. The cell can make 2 ATP molecules from 2 ADP + P using the energy. Pyruvic acid is the end-product. Energy-carrying molecule NAD+ is also “recharged” with electrons.

  9. Fermentation: Chemical Recycling Alcoholic Fermentation

  10. Ethanolic Fermentation Produces Ethanol.

  11. Lactic Acid Fermentation – you do this!

  12. World Changing • About 2.5 Billion years ago, life on Earth changed forever… • Paleontologists mark this time as the change from the Archaen Era to the Proterozoic. • About 90% of the species of organisms alive went extinct in a terrible catastrophe… • What was it???

  13. Photosynthesis Makes Oxygen! Aerobic respiration, made possible by photosynthesis, produces almost 2,000% more energy than anaerobic! That’s a lot of ATP!

  14. Aerobic Respiration is what YOU do.

  15. Aerobic Respiration • 3 main steps: • Glycolysis splits sugar into 2 pyruvate molecules • Krebs Cycle “burns” pyruvate to make energy + CO2 • E- trans. Chain in mitochondria produces MANY MANY ATP

  16. Recap • Cellular Respiration

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