However, its exact location within a cell depends on whether ... of two polynucleotides that are arranged such that the nitrogenous bases within one polynucleotide are attached to the nitrogenous ...

How can just four nitrogenous bases--adenine, cytosine, guanine, and uracil--possibly code for all 20 amino acids? Thus, early researchers quickly determined that the smallest combination of As ...

Among the findings, the Japanese contributors detected all five nitrogenous bases, molecules required for building DNA and RNA, supporting the theory that asteroids could have brought the building ...