Explanation:

- Cell wall (Option 1): Not all living cells have a cell wall. For instance, animal cells lack this structure. In contrast, plants, fungi, and some bacteria have it.

- Plasma membrane (Option 2): All living cells, whether prokaryotic or eukaryotic, possess a plasma membrane. It acts as the boundary of the cell and regulates what enters and exits.

- Cytoplasm (Option 3): Found in all living cells, cytoplasm is the jelly-like substance that fills the cell interior, holding organelles and facilitating metabolic processes.

- Genetic material (Option 4): Present in all living cells, it contains the information necessary for cell function and reproduction, whether in the form of DNA or RNA.

Correct Answer: Option 1 - Cell wall