Variable Loop In Trna Role

Structure Three Dimensional Trna

FIGURE 14-3 A subset of modifief nucleosides found in tRNA. plays an important role in the process ofcedon recognition by certain tRNAs. tRNAs Share a Common Secondary Structure that Resembles a Clover leaf As we saw in Chapter 6, RNA molecules typically contain regions of self-complementarity that enable them to form limited stretches of double helix that are held together by base pairing. Other regions of RNA molecules have no complement and hence, are single-stranded. tRNA molecules exhibit...

The Mechanism Of Dna Polymerase

Dna Base Pairs Interacting With Arg

DNA Polymerases Use a Single Active Site to Catalyze DNA Synthesis The synthesis of DNA is catalyzed by an enzyme called DNA polymerase. Unlike most enzymes, which have an active site dedicated to a single reaction, DNA polymerase uses a single active site to catalyze the addition of any of the four deoxynucleosido triphosphates. DNA polymerase accomplishes this catalytic flexibility by exploiting the neatly identical geometry of the A T and G C base pairs remember that the dimensions of the...