amino acids Archives

July 1, 2026June 27, 2026

The Fine-Tuning of the Genetic Code

Yesterday, we examined the fact that the 20 amino acids commonly used in biological proteins are not a random set but are precisely fine-tuned for optimal protein synthesis. But that is only the beginning of the fine-tuning of the genetic code. A series of articles by biologist Dr. Jonathan McLatchie reports on further fine-tuning.

Cell reproduction requires the replication of the DNA contained within those cells. RNA is the molecule that facilitates DNA replication. RNA has 64 different codons–three-letter “words” that are the fundamental units of the genetic code. Of those, 61 specify amino acids that build proteins, and the other three are stop codons that mark the termination point in creating those proteins. As we mentioned before, there are 20 amino acids used for life. Since there are 64 codons, “a marvel of molecular logic” selects the proper amino acids. That coding system shows evidence of a conscious, deliberate, intelligent agent guiding the creation of the genetic code.

The genetic code in living cells seems to be beautifully fine-tuned to protect cells from mutations during replication. As reported by Dr. McLatchie, the statistical rarity of the conventional genetic code is 1 in 2 billion. That does not seem to be a random chance occurrence. But there are additional levels of fine-tuning, including the fact that the genetic code has been written to reduce the impact of frameshift mutations. It’s beyond the scope of this article to discuss what frameshift mutations are, but the point is that the 64-to-20 mapping system is designed to minimize the number of amino acids translated from a frameshifted transcript before a stop codon halts the process.

But that does not fully cover the fine-tuning of the genetic code. It has multiple layers of highly optimized, independent constraints. The genetic code has been established and used by all forms of life on this planet, with each of the 20 amino acids tied to specific codons. Making significant modifications to the code would create major problems in every cell because the relationships between codons and amino acids are essential for every polypeptide (protein) the cell makes.

Dr. McLatchie’s report contains this statement: “Why is the genetic code the way it is, and how did it come to be? That was asked over 50 years ago, at the dawn of molecular biology, (and) might remain pertinent even in another 50 years.” The point I make is that until scientists consider the possibility of an intelligent Agent who designed the genetic code, that question will never be answered. Why not at least consider the possibility that all these signs of the fine-tuning of the genetic code are not merely accidental but the product of design? The reason modern science refuses to do so is that design requires an intelligent Designer.

Reference: scienceandculture.com HERE, HERE, HERE, and HERE

June 30, 2026June 26, 2026

The Amino Acid Set Was Fine-Tuned for Life

Organic compounds are large molecules containing carbon and having carbon-hydrogen or carbon-carbon bonds. Many organic compounds are involved in life, and life as we know it could not exist without carbon. One group of organic compounds, known as amino acids, numbers at least 500. Of those, only 20 (or, in some cases, 22) are used in plants and animals. Why and how were these amino acids selected to make living things? Amazingly, the amino acid set was fine-tuned for life.

There are three possibilities for how they could have been “selected.” The selection could have been due to chance, with no intelligent agent involved. It could have been because of necessity, meaning that some kind of law could allow only those amino acids to be selected. The third possibility is selection by an intelligent agent with a purpose. Did this apparent choice happen because of mere chance or because of laws that required no other choice? No known laws required this selection, and chance seems questionable since the choice appears to be perfect.

With many alternatives, why this 20? Would any 20 out of the 500 work just as well? The answer is “No,” according to a research paper published in the journal Astrobiology, titled “Did Evolution Select a Nonrandom Alphabet of Amino Acids?” by Gayle K. Philip and Stephen J. Freeland. They wrote, “Random chance would be highly unlikely to represent the chemical space of possible amino acids with such breadth and evenness in charge, size, and hydrophobicity (properties that define what protein structures and functions can be built).” In other words, these 20 amino acids represent the best choice. You can say that the amino acid set was fine-tuned for life.

We have often talked about the cosmic creation event (“big bang”), the laws of physics, the physical constants, and the fundamental forces of nature as having been fine-tuned for life. It appears that the amino acid set was fine-tuned for life. The amino acids that make up the proteins in our bodies seem to be optimally selected. They must have been selected by an agent with the wisdom and power to design a complex, finely tuned, information-rich system, which we call life. We suggest that the agent is the God of the Bible. Tomorrow, we will examine more fine-tuning within our DNA.

References: scienceandculture.com

March 3, 2025March 2, 2025

The Origin of Life on Earth Is Not Found on Bennu

One of the great engineering accomplishments of NASA was the OsirisREx spacecraft landing on asteroid Bennu asteroid in October 2020. Not only did it land, but it also took surface samples of the asteroid and returned them samples to Earth. The samples arrived in September of 2023 and examinations of the asteroid material showed that 14 of the 20 known amino acids, the building blocks of life, were present in the asteroid material. The media jumped on that fact and proclaimed that it was now certain that life originated in outer space. The tabloids proclaimed that aliens had clearly seeded space with life forms, explaining the origin of life on Earth.

It is true that we know amino acids are produced in astronomical processes. In fact, scientists have known that for a very long time. They have shown up in certain types of meteorites found on Earth. What the mainstream media has not reported is that amino acids have a shape orientation to them. The molecule arrangement in amino acids causes them to be either right-handed or left-handed. Life as we know it is made up of 100% left-handed amino acids. Science is still looking for the reason, but the amino acids on Bennu are 50% right-handed and 50% left-handed. In other words, They could not explain the origin of life on Earth.

Every discovery made by science raises more questions. An analogy that may be applied is what happens when you put an ordinary key into a lock. If you try to insert the key upside down, it will not work. The wisdom of having only left-handed amino acids doubles life’s food supply, and that may be the answer to why. But one thing is sure: there is a reason for what Bennu teaches us and for the design of life.

Reference: apod.nasa.gov for February 12, 2025.