The model below represents a DNA molecule. The presence of which element best provides evidence that nucleotides are the building material used to make DNA?

DNA has 3 components; phosphate, a sugar called deoxyribose (a 5 carbon sugar as opposed to the sugar in the picture which is a 6 carbon sugar - glucose) and a nitrogenous base (adenine, thymine, guanosine or cytosine). So if you look at those 3 pictures, the only one is the nucleotide that's part of the DNA.

Re-read the question: the presence of phosphorous is the answer!!

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PratikshaS PratikshaS · Answer 2 · 2022-06-19T10:22:43+02:00

The presence of nitrogen element provides evidence that nucleotides are the building material used to make DNA.

What is DNA?

DNA stands for deoxyribonucleic acids and is a genetic material.
It is made up of polynucleotide chains.
Nucleotide consists of: deoxyribose sugar, phosphate group and nitrogenous bases.
Deoxyribose sugar is a 5-carbon compound in which H is present instead of OH group at 2nd carbon.
The sugar is bonded to nitrogenous base by forming a glycosidic bond.
The nitrogenous bases are the nitrogen containing compound. It is of two types purines and pyrimidines.
Purines consists of Adenine and Guanine whereas Pyrimidines consists of Cytosine and Thymine.
Adenine pairs with Thymine by forming two hydrogen bonds.
Guanine pairs with Cytosine by forming three hydrogen bonds.
The sugar and phosphate makes the backbone of DNA and each bases are attached to this sugar.

Hence, the element is nitrogen.

To know more about nucleotides here

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