Question Detail
Question
Chloroplast Stroma, Mitochondrial Matrix and Bacteria contain: A. 60S ribosomes B. 70S ribosomes C. 80S ribosomes D. 90S ribosomes
Correct Answer
Option B is the correct answer.
Detailed Explanation
This points to the endosymbiotic theory. Chloroplasts and mitochondria are thought to have originated from free-living prokaryotes (bacteria). As a result, they contain their own ribosomes, which are similar to prokaryotic ribosomes (70S), not the larger 80S ribosomes found in the eukaryotic cytoplasm.
Hint
These locations all have a connection to ancient bacteria, so their ribosomes are the smaller type.