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Bell-Ringer

Bell-Ringer. What is the first step of Cellular Respiration? a) Aerobic Respiration b) Krebs Cycle c) Glycolysis d) Glucose

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Bell-Ringer

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  1. Bell-Ringer • What is the first step of Cellular Respiration?a) Aerobic Respirationb) Krebs Cyclec) Glycolysisd) Glucose • ATP is formed during glycolysis when…a) the cell breaks the glucose molecule in halfb) the cell removes phosphate groups from the sugar moleculesc) the cell adds phosphate groups to the G3P

  2. Bell-Ringer 3) Draw a G3P molecule with two phosphate groups attached (hint: this is the step right before ATP is made) 4) How are photosynthesis and cellular respiration related?a) Both create sugar moleculesb) Both create ATPc) They are the same equations, just backwardd) They are not related

  3. More Inside the Blue Monster...[Krebs Cycle Review]

  4. Review • At the end of glycolysis, glucose has been changed into two 3-carbon chains and the cell has a net gain of two ATP.

  5. Cellular Respiration • After glycolysis, the two 3-carbon chains start the process of aerobic respiration (the second half of cellular respiration.)

  6. Cellular Respiration • After glycolysis, the two 3-carbon chains start the process of aerobic respiration (the second half of cellular respiration.) • Aerobic respiration is made up of two distinct steps: • The Krebs Cycle • The Electron Transport Chain

  7. Cellular Respiration • After glycolysis, the two 3-carbon chains start the process of aerobic respiration (the second half of cellular respiration.) • Aerobic respiration is made up of two distinct steps: • The Krebs Cycle • The Electron Transport Chain Today, we are going to follow the Blue Monster’s food through the Krebs Cycle

  8. Krebs Cycle • The Krebs cycle begins with one of the 3-carbon molecules left over from glycolysis.

  9. Krebs Cycle • Before the Krebs cycle can begin, the 3-carbon molecule moves into the cell’s mitochondria. • All steps of the Krebs Cycle occur within this organelle.

  10. Krebs Cycle • The Krebs Cycle also occurs in 4 steps.

  11. Krebs Cycle • Before the Krebs Cycle begins, the 3-carbon molecule from glycolysis has one carbon removed. • The new, 2-carbon molecule is referred to as Acetyl CoA.

  12. Krebs Cycle • The 2-carbon Acetyl CoA molecule combines with an Oxaloacetic Acid molecule to become a 6-carbon sugar molecule. • The 6-carbon molecule is known as Citric Acid

  13. Krebs Cycle 2) Citric Acid loses a CO2 molecule, creating a new 5-carbon molecule.

  14. Krebs Cycle 2) Citric Acid looses a CO2 molecule, creating a new 5-carbon molecule. • This CO2 molecule is a waste product that exits the blue monster as he breathes out.

  15. Krebs Cycle 3) The 5-carbon sugar loses another CO2. • An ATP molecule is formed from the energy in this broken bond.

  16. Krebs Cycle 3) The 5-carbon sugar loses another CO2. • An ATP molecule is formed from the energy in this broken bond. ATP Gain for Krebs Cycle:

  17. Krebs Cycle 3) The 5-carbon sugar loses another CO2. • An ATP molecule is formed from the energy in this broken bond. ATP Gain for Krebs Cycle: 1 ATP

  18. Krebs Cycle 4) The 4-carbon sugar is reformatted into an Oxaloacetic Acid.

  19. Krebs Cycle 4) The 4-carbon sugar is reformatted into an Oxaloacetic Acid. • This oxaloacetic acid molecule comes back into the Krebs cycle at step one to create another 6-carbon molecule.

  20. Krebs Cycle The Krebs cycle moves in a circle, each time recreating the compounds needed for the cycle to continue.

  21. Tomorrow: The Electron Transport Chain

  22. Inside the Monster Illustrations • Illustrate Glycolysis on the front • Krebs on the back • Add color!

  23. Exit Slip • Which answer below lists the steps of Cellular Respiration in the correct order? a)Glycolysis, Electron Transport Chain, Krebs Cycle b) Electron Transport Chain, Krebs Cycle, Glycolysis c) Krebs Cycle, Glycolysis, Electron Transport Chain d) Glycolysis, Krebs Cycle, Electron Transport Chain

  24. 2) What must occur before the Krebs cycle can start?a) G3P is turned into a glucose moleculeb) G3P is turned into Acetyl CoAc) G3P has the phosphates removed d) G3P is turned into Oxaloacetic Acid 3) We know the Krebs Cycle is occurring within our bodies because… a) We have glucose in our blood streamb) We breathe out CO2, a by-product of Krebsc) We breathe in O2, needed to start Krebsd) We breathe out CO, a by-product of Krebs

  25. 4) What is the net ATP gain for Glycolysis and the Krebs Cycle? • 2 • -2 • 3 • 4

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