Which statement is true of DNA?
It is used by ribosomes for translation.
Successive nucleotides in a strand are connected by hydrogen bonds.
A phosphate group in a nucleotide is attached to the 3' carbon in ribose.
A purine always forms a complementary base pair with a pyrimidine.
The percentage of the purine A always equals the percentage of the purine G.

A purine always forms a complementary base pair with a pyrimidine.

Explanation:

Purine bases such as Adenine pair specifically with Thymine , a pyrimidine base forming two bonds; just as Guanine pair specifically with Cytosine forming three bonds.

This specific base pairing are complimentary in nature and grants stability to the DNA.

the dna of humans and mice is almost 92% similar. this similarity indicates that . mice have a tail, while humans have a tailbone. the tailbone is a structure in humans.yes it's true.