Peptidoglycan occurs between the chloroplast membranes of glaucophytes, the first eukaryote group to branch off following primary endosymbiosis.This is strong evidence that all chloroplasts arose from the engulfment of one cyanobacterium by a larger eukaryotic cell, because
A) peptidoglycan is a photosynthetic pigment.
B) peptidoglycan occurs in the cell wall of bacteria.
C) eukaryotes produce peptidoglycan during phagocytosis.
D) prokaryotes produce peptidoglycan as a toxin against predators.
E) peptidoglycans were obtained by conjugation.

Question

Quizplus · Accepted Answer

Peptidoglycan is a component of the cell wall in bacterial cells. Its presence in the chloroplast membranes of glaucophytes suggests that the chloroplasts in these organisms were derived from a cyanobacterium, which also has peptidoglycan in its cell wall. This supports the endosymbiotic theory, which suggests that chloroplasts originated from the engulfment of a cyanobacterial cell by a eukaryotic host cell.

Peptidoglycan Occurs Between the Chloroplast Membranes of Glaucophytes, the First