Right now it's biochem/microbiology. Found an entire lecture series on the bay and have almost completed it. Current lecture is on codons/anti-codons, all of them are 3 base pairs with Uracil/Thymine (resp.), Cytosine, Adenine or Guanine (TCAG which I like to remember as 3CAG; FREE PALESTINE)

Transport RNAs are specific to one of twenty amino acids by the anti-codon on it's base. The tRNA attach to their amino acid and slot into the ribosome in accordance to the codons on the messenger RNA it's translating. This creates a chain of amino acids that naturally fold as it's created because some aminos are polar and attach to each other. This is what is known as protein folding.

Like anal beads and some beads are magnetic, so when you pull them out some attach to each other creating loops and bends.