Which organisms represent the common ancestor of all photosynthetic plastids found in eukaryotes?
A. dinoflagellates
B. red algae
C. cyanobacteria
D. diatoms
E. autotrophic euglenids
I'm stuck between red algae and cyanobacteria. Please help
2007-10-21 05:14:52 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Biology
The cyanobacteria are the blue green algae, which are prokaryotes. The are thought to be the origin of the chloroplast. The red algae belong to the division Rhodophyta. Although some species are unicellular, most of them are large plants.
2007-10-21 05:33:47 · answer #1 · answered by OKIM IM 7 · 1⤊ 1⤋
c. cyanobacteria.
All of the other selections are themselves eukaryotes and therefore could not possibly be regarded as the ancestors of a eukaryotic organelle.
2007-10-21 13:39:27 · answer #2 · answered by Anonymous · 2⤊ 0⤋
cyanobacteria
2007-10-21 12:23:26 · answer #3 · answered by chopchopchops 3 · 2⤊ 0⤋