Given below are two statements: Statement I: Nucleotides are joined together by phosphodiester linkage between 5' and 3' carbon atoms of the pentose sugar. Statement II: In the secondary structure of DNA, adenine forms three hydrogen bonds with thymine whereas cytosine forms two hydrogen bonds with guanine. In the light of the above statements, choose the correct answer from the options given below:

Step-by-step solution

Statement I is correct because in a polynucleotide chain, nucleotides are linked together by phosphodiester linkages between the 3' carbon atom of the pentose sugar of one nucleotide and the 5' carbon atom of the pentose sugar of the adjacent nucleotide. Statement II is incorrect because in the secondary structure of DNA, adenine pairs with thymine through two hydrogen bonds, whereas cytosine pairs with guanine through three hydrogen bonds. Answer: Statement I is true but Statement II is false.