View Single Post
Orion1
#38
Dec3-10, 07:33 PM
Orion1's Avatar
P: 989

Quote Quote by DaveC426913
Ivan Semaniuk made a good point in a sound bite.

He suggested it is not so much that this bacterium is making As-DNA, simply that As is getting substituted for P in the existing DNA.
If the bacterium strain GFAJ-1 of the Halomonadaceae family of Gammaproteobacteria is introduced into an environment that is Phosphorus poor and Arsenic rich and the As-DNA substitutions are the result of quantum chemistry, then if this strain is introduced into an environment that is Phosphorus poor and Nitrogen rich, then by quantum chemistry would the strain substitute Nitrogen for Phosphorus as N-DNA?

Similarly, if this strain is introduced into an environment that is Carbon poor and Boron rich, then by quantum chemistry would the strain substitute Boron for Carbon as B-DNA?
Quote Quote by Ygggdrasil
Definitely not, especially because Si-life would not be expected to function at the temperatures and pressures present on Earth. Furthermore, it's still not clear whether the organism actually functions using As-DNA instead of P-DNA.
There is the possibility that these substituted R-DNA strands are completely non-functional and inert molecules and completely incapable of transcription and replication.