Question

7. According to Philip Bell’s viral eukaryogenesis hypothesis, the presence of linear chromosomes, with centromeres and telomeres, and 5’-capping and 3’-polyadenylation of mRNA, was first provided by:

A. an endosymbiotic archaeobacterium

B. an endosymbiotic gram-negative eubacterium

C. a double-stranded DNA virus

D. a gram-negative eubacterial host cell

E. an archaeobacterial host cell

Answer 1

According to Philip Bell’s viral eukaryogenesis hypothesis, the presence of linear chromosomes, with centromeres and telomeres, and 5’-capping and 3’-polyadenylation of mRNA, was first provided by:

C. a double-stranded DNA virus

According to this hypothesis the viral elements contributed to the nucleus. These Viruses may have been used as storage by ancient cells. Hence, it is postulated that the presence of linear chromosomes in modern cells has viral origin.