First slide
The DNA
Question

What does the figure represent?

Easy
Solution

It is the chemical structure of a polynucleotide chain (DNA  or RNA). A nucleotide has three components – a nitrogenous base, a pentose sugar (ribose in case of RNA, and deoxyribose for DNA), and a phosphate group. All these components are present in the figure given above. Hence, it is representing a polynucleotide chain.

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