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

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

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.

Glycolysis is the first stage in cellular respiration.

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

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.

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

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.

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

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

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