Shown below is a structure in which two amino acids are connected by a peptide bond. What are the names of the two amino acids in this structure? [Select TWO options.] Leucine Phenylalanine Alanine Threonine Aspartate (a.k.a. aspartic acid) Valine Methionine Glutamate (a.k.a. glutamic acid) Isoleucine Arginine Glutamate (a.k.a. glutamic acid) Isoleucine Arginine Cysteine Tryptophan Proline Serine Asparagine Histidine Lysine Glutamine Glycine Tyrosine