Which of the following structures is ALWAY S found in both eukaryo tic and prokaryotic cells? ibosomes mitochond ria nucleus cell wall

## Step 1<br />The question asks us to identify the structure that is always found in both eukaryotic and prokaryotic cells. Eukaryotic cells are more complex and contain a nucleus and other membrane-bound organelles, while prokaryotic cells are simpler and lack a nucleus.<br /><br />## Step 2<br />We need to evaluate each option:<br /><br />- Mitochondria: These are the powerhouses of the cell and are responsible for producing energy. They are only found in eukaryotic cells.<br /><br />- Nucleus: This is the control center of the cell and contains the cell's DNA. It is only found in eukaryotic cells.<br /><br />- Cell wall: This is a rigid layer that provides support and protection to the cell. It is only found in prokaryotic cells.<br /><br />- Ribosomes: These are the sites of protein synthesis in the cell. They are found in both eukaryotic and prokaryotic cells.<br /><br />## Step 3<br />Based on the information above, the only structure that is always found in both eukaryotic and prokaryotic cells is ribosomes.