In DNA does the base composition must have the amount of purines equal to the amount of pyrimidines?

In DNA does the base composition must have the amount of purines equal to the amount of pyrimidines?or
RNA is usually much longer than DNA?
or
RNA has a free 2' hydroxyl.???

These are a little complex and I need some support

xarrium
Okay... I don't know about the RNA questions, but don't purines match with pyrimidines in base-pairs? I was taught that you need to have one purine match with one pyrimidine (guanine to cytosine or adenine to thymine), so it makes sense that the numbers of purines and pyrimidines are about equal.

M F
1) In a perfect piece of DNA the number of purines equals the number of pyrimidines (in some mutated pieces of DNA this my not be the case, but that is a whole other complicated answer) because base pairing occurs between a purine and a pyrimidine (never purine-purine, or pyrimidine-pyrimidine).

2) RNA is much SHORTER than DNA.

3) DNA contains deoxyribose (de- meaning 'no' and -oxy meaning 'oxygen'). There is no hydroxyl group on the 2' carbon of the ribose ring of DNA. However, RNA contains ribose which includes a hydroxyl group on the 2' carbon of the ribose ring. --> RNA DOES have a 2' hydroxyl group.

Pierian
Not always: some viruses have single-stranded DNA. In these cases there is no reason for the % purines to equal the % pyrimidines.
No
Yes

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