Question

Evidence suggests that first, ____________ were acquired when an aerobic bacterium was engulfed by larger cells and became mutually dependent and second, ____________ were acquired by the same means. Because all eukaryotic cells contain organelles, it is obvious that they were aquired before ____________ . Some additional proof of the endosymbiotic theory includes the similarity in size between bacteria and mitochondria and cyanobacteria and chloroplasts. Also, the DNA of mitochondria and chloroplasts is in a circular loop, like those of prokaryotes. Finally, mitochondria and chloroplasts have their own ____________ , which are similar in size and structure to those of prokaryotes. ribosomes chloroplasts organelles Golgi appartus viruses size mitochondria circular loop molecules

Answer 1

Answer:

1. Mitochondria

2. Chloroplast

3. the formation of eukaryotic cells

4. DNA

Explanation:

The theory of endosymbiosis was proposed by the Lynn Margulis in 1967 which suggested that the eukaryotic organelles like the mitochondria and chloroplast evolved when another prokaryotic cell engulfed the prokaryotic bacteria.

The mitochondria were formed when the chemosynthetic bacteria were engulfed by the bacteria and the engulfed bacteria formed a symbiotic relationship. Similarly, the chloroplast was originated in the same way when the photosynthetic bacteria were engulfed by another prokaryote.

The evidence which supports their ar:

1. The same size of the organelles to the bacteria

2. The presence of the circular DNA of the organelles like bacteria  

3. The similarity in the 30s and 70s ribosomal subunits.

Answer 2

Answer:

Mitochondria, chloroplast, eukaryotic cells and DNA.

Explanation:

The endosymbiont theory explain the evolution of the mitochondria and chloroplast. According to this theory, prokaryotic cells engulf the different bacteria that become an organelle later.

Mitochondria was the first evolved then the chloroplast and engulf by aerobic bacteria. Chloroplast formation occurs in the same way. The origin of the mitochondria and chloroplast occurs before the evolution of the eukaryotic cells. These are semi autonomous organelle and contain their own DNA.

Thus, the answer is mitochondria, chloroplast, eukaryotic cells and DNA.