What is common to all life?
1. Liquid Water
Liquid water acts as an extremely efficient solvent which
dissolves reactants, allowing the reactants to move around in their liquid
state. Liquid water is the best solvent in nature.
2. Carbon Chemistry
Carbon is the only element which can form complex changes
at low temperatures.
How is life based on carbon chemistry?
cytosine, thymine, adenine, and guanine or C, T A and G
These 4 bases form 2 sets of base pairs:
The ordering of the bases contains the genetic information.
is achieved by the splitting of the DNA molecule. The molecule splits
down the middle of the base pairs. Now each strand can attach itself
to a new strand, combining together to form a new double-helix, identical
to the original. From one double helix comes 2 identical copies.
ii. tRNA (transfer RNA)--decodes the information on the mRNA using ribosomes and forms a new protein
iii. rRNA(ribosomal RNA)-- combines with proteins to form the ribosomes used by tRNA
Note: this does not mean that life
in hot springs
The norm for life on Earth may be hyperthermophilic and the origin may have been in a CO2 atmosphere.
Life can exist in many different
environments. Organisms are creative in their use of available energy.
In order to understand how and where life could develop in the cosmos,
we must look for all the different kinds of energy sources available.