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I hope i would get logical answers. I request to post it as soon as possible.

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    Commented Jul 6, 2017 at 14:32

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enter image description here

[Source]

DNA is a polynucleotide. The above structure is of a nucleotide which has three components, a nitrogenous base(yellow), a pentose sugar(purple) and a phosphate group. These nucleotides form phosphodiester linkages to form a polynucleotide.

enter image description here

[Source]

These phosphodiester linkages are formed between 3' and 5' carbons of the pentose sugar which is shown in the above image.

enter image description here

[Source]

The end of DNA having a free phosphate group at 5' of pentose sugar is known as the 5'-end of DNA, and the end of DNA having a free hydroxyl group at 3' of pentose sugar is called the 3'-end of DNA.

Here, you can play with the DNA.

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