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Based on the numebr of complementary hydrogen bonds. C (cytosine) bonds with G (guanine) through 3 hydrogen bonds whereas T (thymine) bonds with A (adenine) with only two.

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Rubye Mante

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Q: Why do the purines bond with pyrimidines in the DNA ladder?
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What nucleotides bond?

In DNA, there are four types of nucleotides. These are Guanine, Cytosine, Thymine and Adenine. Guanine and Adenine are purines whereas Cytosine and Thymine are pyrimidines. Adenine will always bond with thymine in DNA. Therefore, guanine and cytosine bond together. These comnplementary base pairing allows the DNA to be replicated and is also used in protein synthesis.


A double-stranded DNA molecule contains a total of 120 purines and 120 pyrimidines This DNA molecule could be composed of?

I don't really understand the point of the question but let's see what we can do. Purines are Adenine and Guanine Pyrimidines are Tyimine and Cytosine Since A pairs with T and G pairs with C, the molecule can be composed of any number of ACTG where A+G=C+T=120 and A=T and G=C Hope that helps.


What kinds of bonds hold the bases together to create the rungs of DNA?

"There are four bases, adenine, guanine, cytosine, and thymine, in DNA. The bases give DNA their variety. The bases are the "rungs" in the double helix ladders and the "handles"of the double helix are composed of deoxyribose sugar and phosphate. Hydrogen bonds hold all of these components together." (This answer was copy and pasted from another answer.)


What is a pyrimidine in biology?

Pyrimidines are single ringed aromatic structures that make up 3 of the basic building blocks of ribonucleic acid (RNA) and deoxyribonucleic acid (DNA). Exampes include cytosine, thymine and uracil.


Account for the formation of precipitate in the test for purines.?

The formation of precipitate in the test for purines is used because purines cannot be found in human DNA unless a test is performed to find their waste or byproducts. Purines cannot be tested for without boiling in alcohol to break them down.