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Question

Ester linkages occur in
  1. Nucleic acids
  2. Nucleus
  3. Carbohydrates
  4. Proteins

A
Carbohydrates
B
Nucleic acids
C
Nucleus
D
Proteins
Solution
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DNA and RNA are the chain of polynucleotide which are joined by ester linkage known as phosphodiester bonds. DNA resembles RNA as both has polynucleotide chain. The two nucleotide is linked by the phosphodiester bond. It is formed by the linkage between the 3' carbon atom of one sugar molecule and the 5' carbon atom of another. Two hydroxyls (OH) groups on the phosphate molecule bind to the 3’ and 5’ carbons on two independent pentose sugars to form a bond.
So, the correct answer is option A.

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