Amino Acid Biosynthesis

Which amino acid biosynthetic family includes alanine and leucine? Select all that apply.

Which starting material(s) are needed for the biosynthesis of isoleucine? Select all that apply.

Which of the following are essential amino acids for humans? Select all that apply.

Which of the following amino acids can be made from α-ketoglutarate and be used to make α-ketoglutarate? Select all that apply.

Which amino acid biosynthetic family can make the most amino acids?

Which amino acid(s) can be made by two different pathways? Select all that apply.