Question

Supporters of "The Virus-First Hypothesis" argue that, in spite of the implausibility of a modern virus coming before cellular life, argue that key elements of virus biology suggest that early ancestors to viruses could have existed first. These key elements are (SELECT ALL THAT APPLY--CAN HAVE MORE THAN ONE ANSWER):

1. that viruses are so diverse.

2. Viruses appear to have unique proteins associated with their replication.

3. Viruses have a mixture (depending on the virus) of elements that appear to be captured from true cells.

Answer 1

Ans .The key elements are following:-

1) viruses are so diverse

2) viruses appear to have unique proteins associated with their replication.

3) viruses have a mixture (depending on the virus) of elements that appear to be captured from true cells.

The " Virus - first hypothesis " states that viruses predated cells and contributed to the rise of cellular life. A significant proportion of all the viral genomes encode for genetic sequences that lack clear cellular homologs. Presence of such virus specific sequences provides support to their unique origin.

Some viruses evolved from the bits of DNA or RNA that escaped from the genes of larger organisms.

Viruses are also more diverse when it comes to reproduction.