Discussion
Consider the following evidence cited for the endosymbiotic theory.
1. Mitochondria possess their own circular DNA.
2. Chloroplast ribosomes resemble those of bacteria.
3. Both organelles are bounded by a single membrane.
Answer: D
The first two are among the strongest lines of evidence. The third is wrong, and indeed the double membrane is itself part of the argument, the inner one deriving from the engulfed bacterium and the outer from the host vesicle.
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