(a(i))[2]
Identify the biochemical structures shown as A and $B_1, B_2$ etc.
(a(ii))[1]
Name the biochemical processes involved in stages 1 and 3.
(b(i))[1]
State the molecular formula of adenine.
(b(ii))[1]
Identify the three other nitrogenous bases in DNA.
(b(iii))[2]
DNA has a double helical structure made of two linked strands. What type of bonding occurs between the phosphate and sugar groups within a DNA strand, and what type of bonding exists between bases on the two strands?
(c)[1]
What type of chemical reaction is this?
(d(i))[1]
Which element in the molecule of ATP will interact most strongly with the X-ray beam?
(d(ii))[1]
Explain why X-ray crystallography will not detect hydrogen atoms.