Chapter 4, Problem 3Q

Summary Introduction

To explain:

A scenario in which it would be advantageous for the Last Common Ancestor to use RNA, while it would be advantageous for its descendants to use DNA.

Introduction:

The bacteria, archaea,and eukaryotes all have evolved from different kind of cells. The precursor of eukaryotes and prokaryotes is known as “Last common ancestor” (LCA). Theory of endosymbiosis explains that a bacterial cell engulfed the descendent cell of LCA (pre eukaryotic) and became the permanent part of LCA cell serving as mitochondria. Later with time, this association gave rise to the formation of the first eukaryotic cell.