1. **Cell Membrane**: Both red blood cells and non-specialized cells are surrounded by a cell membrane, which regulates the passage of substances in and out of the cell. The cell membrane is composed of a phospholipid bilayer with embedded proteins that facilitate communication and transport.

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2. **Cytoplasm**: Both types of cells contain cytoplasm, the gel-like substance that fills the interior of the cell. The cytoplasm houses various organelles, chemical reactions, and provides a medium for metabolic processes. It plays a crucial role in maintaining the cell's structure and function.

3. **Genetic Material**: Both red blood cells and non-specialized cells have DNA, which is the genetic material that carries the instructions necessary for cell function and regulation. Even though mature red blood cells in mammals lose their nucleus (which contains DNA), they originate from precursor cells that do contain genetic material.

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Answer 1

1. Cell Membrane: Both red blood cells and non-specialized cells are surrounded by a cell membrane, which controls the movement of substances in and out. It is made of a phospholipid bilayer with embedded proteins.

2. Cytoplasm: Both types of cells contain cytoplasm, a gel-like substance that supports organelles and metabolic processes, maintaining the cell's structure and function.

3. Genetic Material: Both red blood cells and non-specialized cells have DNA, the genetic material for cell functions. Mature red blood cells lose their nucleus but originate from precursor cells that contain DNA.