Cellular Respiration
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Transcript of Cellular Respiration
Cellular RespirationDo 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?
ATP = Energy
• The phosphate-phosphate bond broken when ATP ADP + Pi releases 30 kJ/mol of energy.
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.
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.
Cellular Respiration
• Is a complex biochemical pathway that breaks down organic chemicals in order to make ATP.
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
The products of glycolysis are used in two different ways
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.
Fermentation: Chemical Recycling
Alcoholic Fermentation
Ethanolic Fermentation
Produces Ethanol.
Lactic Acid Fermentation – you do this!
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???
Photosynthesis Makes Oxygen!
Aerobic respiration, made possible by photosynthesis, produces almost 2,000% more energy than anaerobic!
That’s a lot of ATP!
Aerobic Respiration is what YOU do.
Aerobic Respiration
• 3 main steps:1. Glycolysis splits
sugar into 2 pyruvate molecules
2. Krebs Cycle “burns” pyruvate to make energy + CO2
3. E- trans. Chain in mitochondria produces MANY MANY ATP
Recap
• Cellular Respiration