Science in Christian Perspective
Gastroenterol Jpn. Jun;28(3) Relationship between amino acid transport and protein synthesis in rat isolated pancreatic acini under stimulation. The scheme for protein synthesis. DNA is “read out” in the There are also some interesting relationships between amino acids and their codons. Similar amino. God Shop Now. The two basic parts of the tumbled pebble and the These amino acid chains are the protein molecules responsible for structure and function. In short form, DNA → protein → trait, and that relationship is the.
Selenium is highly reactive, so this amino acid must be handled with care: Structurally, selenocysteine looks just like cysteine, but with a —SeH group in place of the —SH group 4 4. Peptide bonds Each protein in your cells consists of one or more polypeptide chains.
Each of these polypeptide chains is made up of amino acids, linked together in a specific order. The chemical properties and order of the amino acids are key in determining the structure and function of the polypeptide, and the protein it's part of.
But how are amino acids actually linked together in chains?
Darwin's God: Amino Acid Frequency Correlates With the Number of Codons
The amino acids of a polypeptide are attached to their neighbors by covalent bonds known as a peptide bonds. Each bond forms in a dehydration synthesis condensation reaction.
During protein synthesisthe carboxyl group of the amino acid at the end of the growing polypeptide chain chain reacts with the amino group of an incoming amino acid, releasing a molecule of water.
The resulting bond between amino acids is a peptide bond Peptide bond formation between two amino acids. In a peptide bond, the carbonyl C of one amino acid is connected to the amino N of another.
Image modified from OpenStax Biology. Because of the structure of the amino acids, a polypeptide chain has directionality, meaning that it has two ends that are chemically distinct from one another.
At one end, the polypeptide has a free amino group, and this end is called the amino terminus or N-terminus.
The other end, which has a free carboxyl group, is known as the carboxyl terminus or C-terminus. It is a mundane code, like any other, which just happened to evolve early in evolutionary history. But once in place it could not evolve, so it has been preserved ever since. In other words, the DNA code is the result of contingency, not law.
Introduction to proteins and amino acids (article) | Khan Academy
As usual the evolutionary reasoning makes no sense. There is no credible, scientific, explanation for how a code could arise spontaneously in some primitive cell. And if it could not evolve once it was in place, then how could it evolve in the first place? Beyond all this, it certainly is not just another code. For instance, consider Morse code shown below: The letter codes are shorter for those letters that are used more frequently, such as A, E, I, N and T.
Peptide bonds: Formation and cleavage
This serves to minimize the length of the transmitted message and maximize the information conveyed by the telegraph. Similarly the DNA code is an optimized code.
Unlike the Morse code which is a variable word length code, the DNA code uses a constant word length.