Question

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?

Answer 1

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!!

Answer 2

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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