Question

4 building blocks of dna

Answer 1

Cytosine guanine adenine thymine

Answer 2

To form a strand of DNA, the nucleotides are liked into chains with the theposphate and suger groups alternating. so the four types of nitrogenbases foind in the nucleotides are :
adenine (A)
thymine  (T)
guanine (G)
cytosine (C)