Answer:
Part 1:
1 = B (Nucleotides)
2 = C (Nucleus)
3 = D (Deoxyribose)
4 = E (Thymine)
5 = A (Guanine)
Part 2:
x = phosphate (Circle)
y = Nitrogen base (Rectangle)
z = Deoxyribose (Hexagon)
Part 3:
A,A,C,T,T,G,T,A,C,G,G,T (AACTTGTACGGT)
T (Already there) A,A,T,A,A,C,G,C,G (TAATAACGCG)
Hope this helps!