(1) He and his group have found that folate deficiency breaks chromosomes due to massive incorporation of uracil into human DNA.(2) Thymine, present in DNA, and uracil , present in RNA, also contribute to this band.(3) The nitrogen-containing units are the bases: adenine, cytosine, guanine, and uracil .(4) RNA has the same set of four bases, except that instead of thymine, RNA has uracil - commonly referred to as U.(5) Several transformants were obtained by their ability to grow in minimal medium without uracil and uridine but supplemented with arginine.
