Final answer:
The question seeks to identify an amino acid with a hydrophobic side chain from a provided list of numbers. Amino acids such as valine, methionine, and alanine are examples of amino acids with hydrophobic, nonpolar side chains. With the information given in the question, it is impossible to specify which number represents a hydrophobic amino acid without further context.
Step-by-step explanation:
The question asks to identify an amino acid with a hydrophobic R group or side chain. In the field of Biology, amino acids are known to have distinctive R groups that determine their characteristics, such as whether they are hydrophobic or hydrophilic. Amino acids with hydrophobic side chains include valine, methionine, and alanine. These amino acids are nonpolar and tend to avoid water, fitting the definition of hydrophobic. Without knowing the specific amino acids or number options corresponding to the numbers provided in the question, it is impossible to accurately determine the correct answer. However, we can infer that among the options provided, the correct answer will be the one that corresponds to an amino acid with a nonpolar, hydrophobic side chain.