Given below are two statements.
Statement I: DNA is a long heteropolymer of deoxyribonucleotides.
Statement II: Both of the purine types are common in DNA and RNA, but one of the pyrimidine types differs in both DNA and RNA.
In light of the above statements, choose the correct answer from the options given below.

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Both statement I and statement II are incorrect.

Statement I is correct but statement II is incorrect.

Statement I is incorrect but statement II is correct.

Both statement I and statement II are correct.

answer is A.

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Detailed Solution

DNA is a long heteropolymer of deoxyribonucleotides(4 types). Each nucleotide has three components; the pentose sugar, a nitrogenous base and a phosphate group.

There are two types of nitrogenous bases – Purines (adenine and guanine), and pyrimidines (cytosine, uracil and thymine). Cytosine is common for both DNA and RNA and thymine is present in DNA. Uracil is present in RNA in place of thymine.

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