In the 2009 Article "Genomic Footprints of a Cryptic Plastic

Multiple Choice

In the 2009 article "Genomic Footprints of a Cryptic Plastic Endosymbiosis in Diatoms" (Science 324: 1724-26) , Moustafa et al. described their search for possible gene transfer from organelles to the nucleus in diatom genomes. They assumed that diatomic plastids came from red algae. However, they found that most were from green algae. Which is most likely?

A) Diatoms once had green algal endosymbionts.
B) Red algae had green algal endosymbionts.
C) Red plastids were replaced by green plastids.
D) Cyanobacteria imported green plastid genes.
E) All red algal genes mutated to green algal genes.