What structure is common to all domains of living organisms?

• A. Nucleus
• B. Chloroplast
• C. Cell membrane
• D. Mitochondria

Answer: (C)

Verified step by step guidance

1. Begin by understanding the concept of 'domains of living organisms'. There are three domains: Bacteria, Archaea, and Eukarya.
2. Recognize that all living organisms, regardless of their domain, must have certain basic structures to maintain life processes.
3. Consider the options given: Nucleus, Chloroplast, Cell membrane, and Mitochondria. Determine which of these structures are found in all three domains.
4. Recall that the nucleus is a feature of eukaryotic cells, chloroplasts are found in plant cells, and mitochondria are also specific to eukaryotes.
5. Identify that the cell membrane is a fundamental structure present in all cells, providing a boundary and regulating the movement of substances in and out of the cell, making it common to all domains of life.