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Step 1:**Step 1: Glycolysis**
Here, NAD$^+$ is the oxidized form of NAD, ADP is Adenosine Diphosphate, and P$_i$ is inorganic phosphate.
Glycolysis is the first step of cellular respiration and it occurs in the cytoplasm of both eukaryotic and prokaryotic cells. It involves the breakdown of glucose (a six-carbon molecule) into two molecules of pyruvate (a three-carbon molecule), releasing energy in the form of ATP (Adenosine Triphosphate) and NADH (Nicotinamide Adenine Dinucleotide). \text{Glucose} + 2\text{NAD}^+ + 2\text{ADP} + 2\text{P}_\text{i} \longrightarrow \ 2\text{Pyruvate} + 2\text{NADH} + 2\text{ATP} + 2\text{H}^+ + 2\text{H}_2\text{O}
Step 2:**Step 2: Pyruvate Oxidation (or Acetyl-CoA Formation)**
In this step, pyruvate is further oxidized to form Acetyl-CoA, which then enters the Krebs cycle. This step takes place in the mitochondrial matrix of eukaryotic cells and in the cytoplasm of prokaryotic cells. \text{Pyruvate} + \text{CoA} + \text{NAD}^+ \longrightarrow \ \text{Acetyl-CoA} + \text{CO}_2 + \text{NADH} + \text{H}^+
Step 3:**Step 3: Krebs Cycle (or Citric Acid Cycle)**
The Krebs cycle occurs in the mitochondrial matrix of eukaryotic cells and in the cytoplasm of prokaryotic cells. It is a series of reactions that generates more ATP, NADH, and FADH^2 (Flavin Adenine Dinucleotide). \text{Acetyl-CoA} + 3\text{NAD}^+ + \text{FAD} + \text{ADP} + \text{Pi} + 2\text{H}_2\text{O} \longrightarrow \ 2\text{CO}_2 + \text{CoA} + 3\text{NADH} + \text{FADH}_2 + \text{ATP} + 2\text{H}^+
Step 4:**Step 4: Oxidative Phosphorylation**
The final step of cellular respiration is oxidative phosphorylation, which occurs in the inner mitochondrial membrane of eukaryotic cells and in the cytoplasmic membrane of prokaryotic cells. This step involves the electron transport chain and chemiosmosis, producing a large amount of ATP. The energy released by the electron transport chain is used to pump protons across the inner mitochondrial membrane, creating a concentration gradient. The return of these protons to the mitochondrial matrix through ATP synthase leads to the production of ATP. The exact amount of ATP produced varies between species and depends on the efficiency of the electron transport chain, but it is generally much higher than the ATP produced in the previous steps. **
Final Answer
The four main steps of cellular respiration are: 1. Glycolysis 2. Pyruvate Oxidation (or Acetyl-CoA Formation) 3. Krebs Cycle (or Citric Acid Cycle) 4. Oxidative Phosphorylation
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