The synthesis of nucleotides requires several amino acids. Identify each amino acid as a precursor in the synthesis of purines, pyrimidines, both purines and pyrimidines, or neither purines nor pyrimidines.

Leucine, lysine, methionine, glutamine, glycine, histidine, aspartate, alanine, tryptophan.

Red blood cells are responsible for transporting oxygen in the blood. people with sickle cell anemia were born with a defective gene that results in sickle-shaped red blood cells. individuals with the disease often suffer pain in their extremities due to the build-up of these cells causing blockages in the blood vessels. the shape of the blood cells also reduces the amount of oxygen transported in the blood.