Question

Which of the following isn't evidence that supports the endosymbiont theory? - Mitochondria and chloroplast have exterior structures similar to bacterial cell walls - The gene expression processes in these organelles are similar to the bacterial processes

Answer 1

"The exterior structure similar to bacterial cell walls" IS NOT an evidence in favour of the endosymbiotic theory. Both mitochondria and chloroplasts are double membrane bound.

Explanation:

Both the organelles mentioned in your question, are present in eukaryotic cells.

Both mitochondria (the energy producer of the cell) and chloroplast (photosynthetic machinery) have their own circular DNA . (The DNA molecules present in the nucleus of eukaryotic cells are in the form of strings and are not circular. ) We know that circular DNA is more primitive as seen in all bacteria, linear DNA definitely evolved later.

These organelles are also equipped with 70S ribosomes rather than the regular 80S ribosomes of eukaryotes.

Moreover, these organelles can even undergo binary fission like prokaryotic cell.

Answer 2

Explanation:

All living organisms are composed of one or more cells. The cell is the basic unit of structure and organization in organisms. Cells arise from pre-existing cells.