### Step-by-Step Solution
1. **Definition of Prokaryotic Cells**: Prokaryotic cells are simple, unicellular organisms that lack a defined nucleus and membrane-bound organelles.
2. **Cell Structure**: Prokaryotic cells have a single membrane that surrounds the cell, which acts as the outer membrane. All cellular reactions occur in the cytoplasm.
3. **Cell Wall Composition**: The cell wall of prokaryotic cells, particularly in bacteria, is primarily composed of peptidoglycan, which is a combination of sugars and amino acids.
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