Nitrogenous bases are classified as either purines or pyrimidines. examples of purines are

What enzyme is most important for dna replication and why?

9. the history of life on earth is recorded in

According to theories of how life began, how did early organic molecules begin to separate from the outside world? a: specialized enzymes were required b: chains of amino acids created a barrier c: formation of microspheres or vesicles d: rna catalyzed the formation of membranes