Creation of Man (Introduction)

by David Turell , Wednesday, January 16, 2013, 14:36 (4120 days ago) @ BBella


> bbella: So you are saying "if" there is life elsewhere, their DNA would be the same as ours because they would have evolved just as we have, even if they are millions of years ahead of us? -If the aliens are humans their DNA will be like ours. If they are the weird creatures, as in the drawn depictions, it will be different and very obvious in DNA studies. The latter is not found so far. 
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> > David: The way an alien DNA could possibly look different is in base sequence totally out of line with what has been found. None so far, and I don't think it will be found.
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> bbella: What does "base sequence" mean, in laymans terms?-If you look at DNA code it is made up of an amino acid at each tip of a code point, attached to a sugar. This is a base. Adenine (A), guanine(G), cytosine (C), and thymine (T) are the DNA amino acids. On RNA uracil (U) is used for thymine. Three bases in a row give a code for which amino acid to make: The DNA code for Asparagine is AAC, the stuff that gives the odor to asparagus. DNA makes 20 amino acids from this code. They are referred to as the 20 'essential amino acids' for life. They have to be made by DNA to create the proteins of life. Only eight have been found in meteors to seed the Earth. They are not natural on inorganic Earth. Amino acids and all proteins are 3-dimensional in space, and either right or left handed, determined by how solutions of them bend polarlized light. All amino acids are left-handed and the DNA (or RNA) sugars are right-handed. In the lab if one cooks up amino acids or anything else, the resulting molecules will be 50/50% right and left. Life has specific handedness. There is no obvious theoretical reason for this. It just is.