Draw the predominant forms of phenylalanine, tryptophan, and tyrosine present as a mixture at pH 7.

Predominant forms of phenylalanine, tryptophan, and tyrosine at pH 7.

Predominant forms of phenylalanine, tryptophan, and tyrosine with hydroxyl groups at pH 7.

Predominant forms of phenylalanine, tryptophan, and tyrosine with negative charges at pH 7.

Predominant forms of phenylalanine, tryptophan, and tyrosine with positive charges at pH 7.