OBJECTIVE LIFE SCIENCE
CELL BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Mitochondrial DNA in eukaryotic cells
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70S ribosomes in prokaryotic cells
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Gene transfer from prokaryotic cells to eukaryotic cells using plasmids
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Prokaryotic cells (Escherichia coli) in the large intestine digest proteins
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Detailed explanation-1: -> Mitochondria and Chloroplast both have their own DNA and are able to replicate/divide independently of the main cell. This supports the theory that eukaryotic cells engulfed photosynthetic and chemosynthetic prokaryotes at some point in evolution. Option C is the correct answer.
Detailed explanation-2: -Like eukaryotes themselves, mitochondria appear to have arisen only once in all of evolution. The best evidence for the single origin of mitochondria comes from a conserved set of clearly homologous and commonly inherited genes preserved in the mitochondrial DNA across all known eukaryotic groups.
Detailed explanation-3: -Endosymbiotic Theory Evidence. The most convincing evidence supporting endosymbiotic theory has been obtained relatively recently, with the invention of DNA sequencing. DNA sequencing allows us to directly compare two molecules of DNA, and look at their exact sequences of amino acids.