Question

which of the following did not provide evidence that chloroplasts arose from the engulfment of a cyanobacterium by a eukaryotic cell? presence of cyanobacterial pigments in red algae presence of peptidoglycan in glaucophytes nucleic acid sequencing electron microscopy presence of cyanobacterial photosynthetic pigments in green plants

Explanation:

The endosymbiotic theory for the origin of chloroplasts suggests they originated from engulfed cyanobacteria. Presence of cyanobacterial - like pigments in photosynthetic eukaryotes and nucleic - acid sequencing similarities support this. Electron microscopy can show structural similarities. Peptidoglycan is a characteristic of bacteria, and its presence in glaucophytes (a type of algae) also supports the endosymbiotic origin. However, the presence of peptidoglycan in glaucophytes is the key evidence that chloroplasts originated from cyanobacteria. The absence of this evidence would not support the theory.

Answer:

Electron microscopy