Question -
Answer -
A DNA molecule is double-stranded in which the pairing ofbases occurs. Adenine always pairs with thymine, while cytosine always pairswith guanine. Therefore, on hydrolysis of DNA, the quantity of adenine producedis equal to that of thymine and similarly, the quantity of cytosine is equal tothat of guanine.
But when RNA is hydrolyzed, there is no relationship amongthe quantities of the different bases obtained. Hence, RNA is single-stranded.