Answer:
Hydrogen bonds
Explanation:
DNA is a double helical structure that means two nucleotide chains are bonded together. The bonds through which two nucleotide chains are held together are known as hydrogen bonds. DNA is made up of four types of nucleotides named as adenine (A), thiamine (T), cytosine (C) and guanine (G). Out of these four, adenine is complimentary to thiamine and if adenine is present in one nucleotide chain then it bonds with thiamine of other nucleotide chain with the help of two hydrogen bonds while cytosine is complimentary to guanine and bonds with guanine of other nucleotide chain with the help of three hydrogen bonds.
