Final answer:
The number of different amino acids among five possible amino acids depends on the uniqueness of their side chains, with there being 20 common amino acids each having a different R group. There are also 64 possible codons that encode these amino acids, each codon made up of three nucleotides.
Step-by-step explanation:
To answer your question, if there are five possible amino acid structures presented and you are required to determine how many different amino acids actually exist, you must look for unique side chains (R groups). There are 20 common amino acids present in proteins, each with a different R group that determines its chemical nature. Since this specific question doesn't provide the exact structures, the general answer is that if each of the five structures has a unique side chain, then there would be 5 different amino acids. Without more information about the exact structures you are referring to, it's impossible to determine exactly how many of the 20 amino acids they represent.
It is also important to note that there are 64 possible codons which encode for these 20 common amino acids, and each codon consists of three nucleotides. The reason there are 64 codons is because there are four nucleotides and each codon is formed from a combination of three nucleotides, leading to 4 x 4 x 4 (43) possibilities.