The four key building blocks of all life on Earth are in our cells, in its dna.
They make up the DNA band base pairs AT and CG. They are in pairs on the DNA strip like the steps of a ladder, in a double-threaded form.
The most important bases for life are adenine (A), thymine (T), guanine (G), and cytosine (C), as well as the fifth, uracil (U). It occurs in the rna of a cell, usually in a single-stranded genome.
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Now all those bases important to life and inheritance have been found in asteroids and meteorites that have struck Earth. Only two had been found before.
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Astrochemists Yasuhiro Oba The University of Hokkaido now found with its group two of the four DNA bases in the meteorites, cytosine and thymine.
However, scientists consider it unlikely that primitive life was already born on the surface of space rocks.
However, bases may have contributed to the birth of complex molecules and thus primitive life on Earth billions of years ago, says website Science Alert.
“We found base pairs at very low concentrations. There were only billions of them in the weight of the sample, ”Oba said online service for Live Science.
The Japanese discovery proves that the rocks of space that struck the Earth once brought with them all the compounds familiar to life. That was the guess.
The bases were originally formed in space in an accumulation disk with a lot of space gas and dust. The resulting earth was part of an accumulation disk around the young Sun.
Scientists believe the bases were born in photochemical reactions of different elements.
The Japanese studied three different meteorites that are 4.5 to 5 billion years old.
About 4 to 3.8 billion years ago, Earth was hit by a large-scale bombardment of asteroids and meteorites in space.
The rocks that struck the earth may well have contained all the compounds of life now discovered.
The work was published scientific journal Nature Communications.
Source: Tiede by www.tiede.fi.
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