In this investigation, you will observe the release of O2 and CO2 into the environment. Gas production by two types of organisms will serve as evidence of photosynthesis and cellular respiration in action. In part 1, you will vary the amount of sugar present and observe the effect on cellular respiration.

During aerobic cellular respiration, glucose and oxygen combine to create ATP, which the cell can utilise. As byproducts, carbon dioxide and water are produced.

What are the three stages of cellular respiration?

The Krebs cycle, oxidative phosphorylation, and glycolysis—an anaerobic process—are the three phases of aerobic cellular respiration.

All forms of cellular respiration begin with glycolysis, which is anaerobic and oxygen-free. The pathway will go on to the Krebs cycle and oxidative phosphorylation if oxygen is present. However, some species may engage in fermentation to continuously manufacture ATP in the absence of oxygen.

Total amount of ATP molecules generated during aerobic respiration from a single glucose molecule.

During glycolysis:

As 2ATP

From 2NADH 5ATP (oxidation phosphorylation)

In pyruvate oxidation;

From 2NADH 5ATP (oxidative phosphorylation)

Citric acid cycle;

ATP ATP (substrate level phosphorylation)

From 6NADH 15ATP (oxidative phosphyrlation)

From 2 FADH2 3ATP

Total Number ATP = 32 ATP

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