https://pages.htgaa.org/2026a/heather-qian/homework/week-04-hw-protein-design-part-i/index.htmlConceptual Questions Why do humans eat beef but do not become a cow, eat fish but do not become fish? When humans eat, the macromolecules the beef are made of are broken down during digestion into monomers. These monomers are common to all life, and humans use them to build human-specific macromolecules. Why are there only 20 natural amino acids? These 20 amino acids are what evolution happened to select for. These 20 amino acids happen to be enough to build all the proteins that are necessary for life that has evolved on Earth. Theoretically, there could be more, but in our “system” of life, these 20 are enough.Hugoen