Which of the following structures is present in a prokaryotic cell?

• A. Mitochondria
• B. Endoplasmic Reticulum
• C. Nucleus
• D. Ribosomes

Answer: (D)

Verified step by step guidance

1. Understand the basic structure of prokaryotic cells: Prokaryotic cells are simpler than eukaryotic cells and lack membrane-bound organelles.
2. Identify the structures listed in the problem: Mitochondria, Endoplasmic Reticulum, Nucleus, and Ribosomes.
3. Recall that mitochondria, endoplasmic reticulum, and nucleus are membrane-bound organelles, which are not present in prokaryotic cells.
4. Recognize that ribosomes are non-membrane-bound structures responsible for protein synthesis and are present in both prokaryotic and eukaryotic cells.
5. Conclude that among the given options, ribosomes are the only structure present in prokaryotic cells.