Amino acid differences between species provide evidence of evolution due to the underlying genetic variations they reflect. All living organisms use DNA to encode the proteins necessary for life, and these proteins are constructed from a chain of amino acids based on the sequence of nucleotides in the DNA. When mutations occur in the DNA sequence, they can alter the amino acid sequence of the protein. Over generations, these mutations accumulate, leading to variations in the proteins of different species. By comparing the amino acid sequences of analogous proteins across species, scientists can infer evolutionary relationships and the degree of divergence between species. This is because closely related species will have more similar amino acid sequences due to their recent common ancestry, whereas species that diverged earlier will have more differences. Thus, amino acid differences serve as a molecular clock, providing insights into the timing of evolutionary events.

The amino acid is not directly based on the anticodon but rather determined by it through a complementary relationship with the codon on mRNA. During protein synthesis, the anticodon, a sequence of three nucleotides on tRNA, pairs with a complementary codon on mRNA in the ribosome. Each codon specifies a particular amino acid, guided by the genetic code. Thus, the specific anticodon on a tRNA molecule helps ensure that the correct amino acid is added to the growing peptide chain, but the amino acid itself is not "based" on the anticodon. It's the codon's sequence that directly relates to the amino acid's identity, according to the genetic code. The tRNA and its anticodon serve as a crucial intermediary in translating the genetic information encoded in mRNA into a precise sequence of amino acids during protein synthesis.

For a 1641cc VW air-cooled motor, a popular choice is 20W-50 mineral oil, especially in warmer climates or during summer. This viscosity ensures proper lubrication under the heat generated by these engines, which lack efficient cooling systems compared to water-cooled engines. In cooler weather, some may opt for 10W-30 to ease cold starts and reduce strain on the battery and starter motor. It's crucial to avoid oils with friction modifiers that can harm the flat tappet cam. Regular oil changes, every 3000 miles or annually, are recommended to maintain engine health.