Here's why:

* Enzymes: All living cells need enzymes to catalyze chemical reactions essential for life.

* DNA: DNA is the genetic material that carries the instructions for building and maintaining the organism. All living cells have DNA.

* Ribosomes: Ribosomes are responsible for protein synthesis, a fundamental process for all living cells.

* Plasma membrane: The plasma membrane forms the outer boundary of the cell, controlling what enters and leaves. All cells have a plasma membrane.

* Mitochondria: Mitochondria are the powerhouses of the cell, responsible for generating energy (ATP). While some cells may have variations in the number or type of mitochondria, they are present in most eukaryotic cells.

Therefore, the presence of these molecules and structures indicates that the cell is from a living organism, but it doesn't provide enough information to narrow down the specific organism type.