Question

Which correctly shows the order of steps in aerobic cellular respiration?

Option 1: Glycolysis, Pyruvic acid points to Acetyl-CoA, Citric acid cycle, Electron transport chain
Option 2: Glycolysis, Pyruvic acid points to Acetyl-CoA, Electron transport chain, Citric acid cycle
Option 3: Glycolysis, Citric acid cycle, Electron transport chain, Pyruvic acid points to Acetyl-CoA
Option 4: Glycolysis, Citric acid cycle, Pyruvic acid points to Acetyl-CoA, Electron transport chain

Answer 1

The correct order of steps in aerobic cellular respiration is glycolysis, conversion of pyruvate to Acetyl-CoA, citric acid cycle (Krebs cycle), and the electron transport chain.

Step-by-step explanation:

The correct order of steps in aerobic cellular respiration is as follows:

1. Glycolysis
2. Pyruvic acid conversion to Acetyl-CoA
3. Citric acid cycle (also known as the Krebs cycle)
4. Electron transport chain

In aerobic cellular respiration, glycolysis is the first phase where a glucose molecule is broken down into two pyruvate molecules in the cytoplasm of the cell. Then, in the presence of oxygen, pyruvate is transported into the mitochondria and converted into Acetyl-CoA. This marks the second phase.

The third phase is the citric acid cycle occurring in the mitochondrial matrix, where the Acetyl-CoA is fully oxidized to carbon dioxide and high-energy electron carriers (NADH and FADH2) are produced. Finally, these electrons are shuttled through the electron transport chain on the inner mitochondrial membrane, leading to the production of ATP through a process known as oxidative phosphorylation.