Final answer:
An RNA nucleotide contains the sugar ribose, and a set of three nucleotides, termed a codon, encodes for a single amino acid in RNA.
Step-by-step explanation:
The question is related to the structure of RNA nucleotides and how many nucleotides make up the code for a single amino acid. A nucleotide that would be used to make RNA differs from those used to make DNA primarily by the sugar component. RNA nucleotides contain the sugar ribose, whereas DNA nucleotides contain deoxyribose. Additionally, the nitrogenous base uracil is found in RNA in place of thymine, which is found in DNA.
The code for a single amino acid in an RNA molecule is determined by a set of three nucleotides known as a codon. Therefore, it takes three 'letters' or nucleotides of an RNA molecule in sequence to provide the code for one amino acid.