how do current hypotheses about the evolution of eukaryotes explain the origin o
ID: 320033 • Letter: H
Question
how do current hypotheses about the evolution of eukaryotes explain the origin of linear chromosomes in eukaryotic cells?
Question 4 options:
A prokaryotic cell was engulfed by another cell and replication errors created linear chromosomes.
A prokaryotic cell was engulfed by another cell and altered its DNA to be linear.
Neither hypothesis offers an explanation for the origin of linear chromosomes.
A prokaryotic cell was engulfed by another cell and their fused circular chromosomes became linear.
A prokaryotic cell was engulfed by another cell and replication errors created linear chromosomes.
A prokaryotic cell was engulfed by another cell and altered its DNA to be linear.
Neither hypothesis offers an explanation for the origin of linear chromosomes.
A prokaryotic cell was engulfed by another cell and their fused circular chromosomes became linear.
Explanation / Answer
A prokaryotic cell was engulfed by another cell and replication errors created linear chromosomes.
It has been hypothesized that the repetitive capture of non-LTR retrotransposons, with a G/C strand bias, at the ends of DNA double-strand breaks (DSBs) could have eventually resulted in end protection (capping), instead of repair, giving rise to the “proto-telomeres” of the first linear chromosomes
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