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

shreya
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    Welcome to Biology Stack Exchange. I would highly recommend to read the tour before asking any questions. You will also earn your first badge. Take the tour here: https://biology.stackexchange.com/tour . Your question is a replication of the following question: https://biology.stackexchange.com/questions/15082/what-does-5-and-3-mean-in-dna-and-rna-strands .. Please check the link provided for answers. – Johnny Jul 06 '17 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.

Mesentery
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