1. KEY CONCEPT The overall process of cellular respiration converts sugar into ATP using oxygen.

2. Cellular respiration makes ATP by breaking down sugars.
Cellular respiration is aerobic, or requires oxygen.
Aerobic stages take place in mitochondria.
mitochondrion
animal cell

3. The equation for the overall process is: C6H12O6 + 6O2 6CO2 + 6H2O
The reactants in photosynthesis are the same as the products of cellular respiration.
Apply: Does glucose actually react with oxygen during cellular respiration? Explain.

4. Glycolysis is the first stage in cellular respiration.

5. Glycolysis is the first stage in cellular respiration.
anaerobic process (does not require oxygen)
takes place in cytoplasm
glycolysis – splits glucose into two 3-carbon molecules and makes two molecules of ATP.
pyruvates

6. There is a preparation step that must take place between glycolysis and Kreb’s cycle.
This preparation step changes pyruvates into Acetyl CoA
This step moves us from the first stage of cellular respiration to the second stage.

7. The Krebs cycle is the first step of the second stage of cellular respiration.

8. The Krebs cycle is the first step of the second stage of cellular respiration.
The Krebs cycle is aerobic and takes place in the mitochondrial matrix.
breaks down three-carbon molecules from glycolysis
makes a small amount of ATP (1 per pyruvate; 2 total)
transfers energy carriers (3 NADH and 1 FADH2 per pyruvate; 6 NADH and 2 FADH2 total)
- Carbon dioxide (CO2) is given off as a waste product.

9. The electron transport chain is the second step of the second stage of cellular respiration.

10. energy from glycolysis
The electron transport chain produces a large amount of ATP.
takes place in inner membrane of mitochondria
Uses energy carriers transferred from krebs cycle and glycolysis
oxygen used in process (3 per pyruvate; 6 total)
water released as a waste product (3 per pyruvate; 6 total)
ATP produced
(32-34 total)
6H O 2 6O
mitochondrion
inner membrane
ATP
energy
energy from glycolysis 4
and

11. Photosynthesis and cellular respiration comparison
Organelle for process
chloroplast
mitochondria
Reactants
CO2 and H2O
Sugars (C6H12O6) and O2
Electron Transport Chain
Proteins within thylakoid membrane
Proteins within inner mitochondrial membrane
Cycle of chemical reactions
Calvin Cycle in stroma of chloroplasts builds sugar molecules
Krebs cycle in matrix of mitochondria breaks down carbon-based molecules
Products