Which of these are viable suggestions to explain the mixed character of the eukaryotic genome? (Select all correct choices)
A)an archaebacterial cell fused with a eubacterial cell and the genomes integrated
B)eubacterial genes migrated from chloroplasts and mitochondria to become nuclear genes
C)eukaryotic genes migrated from chloroplasts and mitochondria to become nuclear genes
D)eukaryotic cells evolved from archaebacterial ancestors and then picked up eubacterial genes
E)archaebacterial genes migrated from chloroplasts and mitochondria to become nuclear genes

Question

Quizplus · Accepted Answer

The endosymbiotic theory suggests that eukaryotic cells arose from the fusion of an archaebacterial host cell with a eubacterial endosymbiont that eventually evolved into mitochondria. This would explain the presence of both archaebacterial and eubacterial genes in the eukaryotic genome (option A). Additionally, it is known that chloroplasts and mitochondria were originally independent prokaryotic organisms that were engulfed by an ancestral eukaryotic cell. During this process, some genes from the endosymbionts were transferred to the host cell's nucleus, which would explain the presence of eubacterial genes in the nuclear genome (option B). Option C is incorrect because eukaryotic genes did not originate from chloroplasts and mitochondria. Finally, option E is incorrect because archaebacteria did not give rise to either mitochondria or chloroplasts.

Which of These Are Viable Suggestions to Explain the Mixed