Question

11. Discuss the three phases of cellular respiration, included any production of ATP, NADH, FADH2, CO2 produced, and trace the Carbon amounts from start to finish using Glucose (C6H12O6).

Answer 1

The three phases of cellular respiration are glycolysis, kreb cycle and electron transport.

In glycolysis glucose is split in to two molecules of pyruvate. And here 2 ATP(net gain) and 2 NADH are formed.

Before entering into kreb cycle which happends at mitochondria the pyruvate is converted in to Acetyl Co enzyme A.

The Krebs cycle itself actually begins when acetyl-CoA combines with a four-carbon molecule called OAA (oxaloacetate) . This produces citric acid, which has six carbon atoms. This is why the Krebs cycle is also called the citric acid cycle.

After citric acid forms, it goes through a series of reactions that release energy. The energy is captured in molecules of NADH, ATP, and FADH2, another energy-carrying compound. Carbon dioxide is also released as a waste product of these reactions.

The final step of the Krebs cycle regenerates OAA, the molecule that began the Krebs cycle. This molecule is needed for the next turn through the cycle. Two turns are needed because glycolysis produces two pyruvic acid molecules when it splits glucose.

2 ATP, 8 NADH and 2 FADH are produced by kreb cycle.

Electron transport is the final stage of aerobic respiration. In this stage, energy from NADH and FADH2, which result from the Krebs cycle, is transferred to ATP.

A totel of 38 ATP molecules are formed at the end of cellular respiration.