How many different pentapeptides can be constructed from the 20 naturally occurring amino acids in the following table?

Abbreviation Name Structure Abbreviation Name Structure Amino acids with polar side chains Amino acids with nonpolar si de chalns . HN. Glycine Gly G Asparagine Asn N NH2 NH2 Gin Q Glutamine H2N H3C. Alanine Ala A NH2 NH2 Ser S Seine NH2 Valine Val v NH2 Threonine Thr T NH3 Leu L Leucine Tyr Y aine NH2 NH2 Cysteine Cys C HS Isoleucine De I OH NH2 NH2 Amino acids with acidic side chains . Aspartic acid Asp D Methionine Met M NH2 NH2 Glamic acid Giu E NH2 Pro P Proline NH Amino acids with basic side chains Arg R Arginine Phenylalanine Phe F NH2 NH2 Histidine His H NH2 NH Tr W Tryptophan NH2 H2N. Lysine Lys K NH2