**Core Concept**
The genetic code is a set of rules that govern how the sequence of nucleotides in DNA is translated into the sequence of amino acids in proteins. It is a fundamental concept in molecular biology and genetics, essential for understanding protein synthesis and its regulation.

**Why the Correct Answer is Right**
The genetic code is nearly universal, meaning that it is the same in almost all organisms. This universality is due to the fact that the code is determined by the interaction between the mRNA codons and the corresponding tRNA molecules, which are loaded with amino acids. The code is also degenerate, meaning that more than one codon can code for the same amino acid. This is because the genetic code is based on the wobble hypothesis, which proposes that the third nucleotide in a codon can be flexible and allow for variations in the pairing of tRNA with mRNA. Finally, the genetic code is non-overlapping, meaning that each codon specifies only one amino acid, and there is no overlap between adjacent codons.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided.
**Option B:** This option is not provided.
**Option C:** This option is not provided.

**Clinical Pearl / High-Yield Fact**
One key aspect of the genetic code is its universality, which is a testament to the fundamental principles of molecular biology. Understanding the genetic code is essential for understanding protein synthesis and its regulation, and is a critical concept in fields such as genetics, molecular biology, and biochemistry.

**Correct Answer: D.**