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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}^+
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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