Final answer:
The claim that the genetic code is different in nearly all organisms is false. The genetic code is nearly universal, with a few exceptions, and shared among animals, plants, and bacteria. This is evidence of a shared common ancestor and the conservation of biological information.
Step-by-step explanation:
The statement that the genetic code is different in nearly all organisms is false. The genetic code is remarkable for being nearly universal across all known living organisms. With very few exceptions, the same codons specify the same amino acids in animals, plants, and bacteria. This universal genetic code is a key piece of evidence for the common descent of all life on Earth. It shows that the fundamental mechanism of protein synthesis based on triplet codons is shared, which is a highly conserved characteristic that points back to a common ancestor.
There are 64 triplet codons which are used to code for the 20 standard amino acids. The code is described as being 'degenerate', which means that multiple triplets can code for the same amino acid. However, each individual codon is specific for only one amino acid (except in cases where it signals the start or stop of protein synthesis).
Thus, the conservation of codons signifies that an mRNA sequence from one organism can often be introduced into a different organism and still produce the same protein. For example, a globin mRNA from a horse could potentially be inserted into a plant such as a tulip, resulting in the synthesis of horse globin within the tulip cells.