Micro Organisms
Which of the following sequences has helped in identifying eukaryotes, eubacteria and archeabacterial cell types?

Signature sequence
Signal sequence
Shine-Dalgarno sequence
Amino acid sequence

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Micro Organisms
Genetic and biochemical similarities between contemporary cyanobacteria and eukaryotic chloroplasts are accepted to mean that

eukaryotes evolved from bacteria
eukaryotes evolved from archaea
cyanobacteria arose from chloroplasts which escaped from plant cells
oxygenic photosynthesis first evolved in eukaryotes

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