Question

The presence of DNA in mitochondria and chloroplast supports the hypothesis that

• A. Mitochondria and chloroplast both originated as independent free living organisms.
• B. Glycolysis occurs in mitochondria and chloroplast both.
• C. ATP is produced in mitochondria and chloroplast both.
• D. Mitochondria and chloroplast undergo meiosis and mitosis independent of nucleus.

Answer 1

The correct option is A Mitochondria and chloroplast both originated as independent free living organisms.

Both chloroplast and mitochondria were once independent free living organisms and later on became lodged in eukaryotic cells as endosymbionts. This hypothesis is supported by many evidences example both of these organelles are surrounded by double membranes, have their own DNA which is circular like prokaryotic chromosome, have their own ribosomes which are 70S type like prokaryotic ribosomes and are not dependent on nucleus for their multiplication but can increase in number by fission like bacteria.

So, the correct answer is 'Mitochondria and chloroplast both originated as independent free living organisms'