Final answer:
In biology, three nucleotides of an RNA molecule form a codon, which codes for a single amino acid.
Step-by-step explanation:
The answer to the question about RNA molecules and amino acids is found in a biology concept related to the genetic code. In an RNA molecule, it takes three nucleotides to provide the code for a single amino acid. This sequence of three nucleotides is known as a codon. For example, the codon AUG codes for the amino acid methionine, which is also the start codon signaling the beginning of protein synthesis.
The correct answer is D) 4. Up to 4 decline reason can be selected. This means that when declining a request, a tutor has the option to choose from a list of up to 4 different reasons as to why the request is being declined.