(a)[3]
Describe three structural ways in which messenger RNA (mRNA) is different from DNA. For every point, refer to the structure of mRNA and the structure of DNA.
(b(i))[1]
State the letters that show the two purine synthetic bases in Fig. 6.1.
(b(ii))[2]
State and explain which DNA base pair is the most similar to the synthetic base pairs in Fig. 6.1.