Biologists suspect that endosymbiosis gave rise to mitochondria before plastids partly because
A) the products of photosynthesis could not be metabolized without mitochondrial enzymes.
B) all eukaryotes have mitochondria (or their remnants), whereas many eukaryotes do not have plastids.
C) mitochondrial DNA is less similar to prokaryotic DNA than is plastid DNA.
D) without mitochondrial CO2 production, photosynthesis could not occur.
E) mitochondrial proteins are synthesized on cytosolic ribosomes, whereas plastids utilize their own ribosomes.
Cell showing nucleoids within mitochondria
Endosymbiosis in Action
mitochondria
The cell membrane, cytoplasm, nucleus, nucleolus, ribosomes, centrioles, and mitochondria.
Rapid sea level rise
The Rise and Fall of Separation Anxiety