Which of the following is a common trait shared by both chloroplasts and mitochondria?

• A. Both perform photosynthesis.
• B. Both contain their own circular DNA and ribosomes.
• C. Both have a single membrane surrounding them.
• D. Both are found only in plant cells.

Answer: (B)

Verified step by step guidance

1. Understand the question: The problem is asking for a common trait shared by both chloroplasts and mitochondria. This requires knowledge of their structure and function in cells.
2. Recall the key features of chloroplasts: Chloroplasts are organelles found in plant cells and some protists. They are responsible for photosynthesis and contain their own circular DNA and ribosomes, allowing them to produce some proteins independently.
3. Recall the key features of mitochondria: Mitochondria are organelles found in almost all eukaryotic cells, including both plant and animal cells. They are responsible for cellular respiration and also contain their own circular DNA and ribosomes, enabling them to synthesize some proteins independently.
4. Compare the traits of chloroplasts and mitochondria: Both organelles share the trait of having their own circular DNA and ribosomes, which is a unique feature among organelles. This allows them to function semi-autonomously within the cell.
5. Eliminate incorrect options: Chloroplasts perform photosynthesis, but mitochondria do not. Both organelles have a double membrane, not a single membrane. Mitochondria are found in both plant and animal cells, not just plant cells. The correct shared trait is that both contain their own circular DNA and ribosomes.