Question

why chloroplast and mitochondria contain 70s ribosomes? (In eukaryotic 80 ribosomes are present)​

Answer 1

Answer:

70 s ribosomes are usually present in prokaryotes and eukaryotes have 80 s ribosomes with some exceptions like mitochondria and chloroplast. ... Mitochondria and Chloroplasts both have 70s Ribosome, since they are evolved from prokaryotic bacteria and developed a symbiotic relationship with the cell.

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Answer 2

Chloroplast and mitochondria contain 70 ribosomes:

• Mitochondria may have been ancient bacterial cells covered by eukaryotic cells.

• According to "endosymbiosis theory."

• Mitochondria have 70 ribosomes like prokaryotic cells and they also have their own DNA that makes this idea very effective.

• Some of the genes within chloroplast are still being developed.

• Chloroplast (especially in chlamydomonas, records some of its photosynthetic proteins such as Ribulose bisphosphate carboxylase/oxygenase enzyme (RuBPco gene) and other genes such as ATP  B, ATP E and ATP A are expressed.

• These organelle have similar properties such as having 70 ribosomes, DNA, RNA.

• This indicates that mitochondria, chloroplast originated from a prokaryotic cell and this prokaryotic cell is present in a eukaryotic cell.

• Prokaryotes and eukaryotes also have different ribosomal sizes.

• This has to do with the fact that we inherit our mitochondria from our mothers.

• Mitochondria are found in the egg and we can track maternal fertility using mitochondrial DNA.