A researcher from the Columbia University in New York has claimed the possibility that advanced versions of Tyrannosaurus rex and other dinosaurs – monstrous creatures with the intelligence – may be the life forms that evolved on other planets in the Universe.
Tyrannosaurus rex (Nobu Tamura)
“We would be better off not meeting them,” said study author Dr. Ronald Breslow.
The study, published in the Journal of the American Chemical Society, discusses the century-old mystery of why the building blocks of terrestrial amino acids (which make up proteins), sugars, and the genetic materials DNA and RNA exist mainly in one orientation or shape.
There are two possible orientations, left and right, which mirror each other in the same way as hands. This is known as chirality. In order for life to arise, proteins, for instance, must contain only one chiral form of amino acids, left or right.
With the exception of a few bacteria, amino acids in all life on Earth have the left-handed orientation. Most sugars have a right-handed orientation. How did that so-called homochirality, the predominance of one chiral form, happen?
The researcher describes evidence supporting the idea that the unusual amino acids carried to a lifeless Earth by meteorites about 4 billion years ago set the pattern for normal amino acids with the L-geometry, the kind in terrestial proteins, and how those could lead to D-sugars of the kind in DNA.
“Of course, showing that it could have happened this way is not the same as showing that it did,” Dr. Breslow explained. “An implication from this work is that elsewhere in the Universe there could be life forms based on D-amino acids and L-sugars. Such life forms could well be advanced versions of dinosaurs, if mammals did not have the good fortune to have the dinosaurs wiped out by an asteroidal collision, as on Earth. We would be better off not meeting them.”
