Question

Some scientists think that complex eukaryotic cells formed from the union of two separate prokaryotic cells. The engulfing of one prokaryotic cell by another is a plausible explanation of why a organelles in a eukaryotic cell work cooperatively. b organelles in a eukaryotic cell would attack other cells. c eukaryotic cells lack the defense mechanisms of prokaryotic cells. d eukaryotic cells don't share any similarities with prokaryotic cells.

Answer 1

The correct statement that supports the idea of complex eukaryotic cells forming from the union of two separate prokaryotic cells is:

a) organelles in a eukaryotic cell work cooperatively.

This idea is known as the endosymbiotic theory, which suggests that certain organelles in eukaryotic cells, such as mitochondria and chloroplasts, originated from prokaryotic cells that were engulfed by ancestral eukaryotic cells and formed a mutualistic relationship. As a result, these organelles work cooperatively within the eukaryotic cell.