In biosynthesis the base is assembled first and then attached to ribose.

In pyrimidine biosynthesis, the base is assembled first and then attached to ribose. Pyrimidine is a heterocyclic aromatic organic compound which contains two nitrogen atoms at positions 1 and 3 of the six-member ring.Pyrimidine biosynthesis is a biological process which results in the formation of a pyrimidine nucleotide. In pyrimidine biosynthesis, pyrimidines (the base) are synthesized from carbamoyl phosphate and aspartate. Ribose-5-phosphate is then attached to yield pyrimidine nucleotides. Pyrimidine biosynthesis takes place both in the body and through organic synthesis.

The salt in the sea water dehydrated the sailor because her body could not take in the amount to salt in the sea water

The soviet union beat the us to the first successful launch, with the october 4, 1957, orbiting of sputnik 1, and later beat the us to have the first human in earth orbit, yuri gagarin, on april 12, 1961. the "race" peaked with the july 20, 1969, us landing of the first humans on the moon with apollo 11