It has been hypothesized that chloroplasts originated from photosynthetic cyanobacteria that became symbiotic inside a host cell. Which of the following observations provides the strongest evidence for this suggestion?
a) microscopically, chloroplasts appear similar to cyanobacteria
b) chloroplast DNA shows clear similarities to cyanobacteria DNA
c) Both chloroplasts and cyanobacteria are green and perform photosynthesis
d) Photosynthesis cyanobacteria and fungi form a mutualistic association in lichen
Answer: b) chloroplast DNA shows clear similarities to cyanobacteria DNA
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