BIOMOLECULES AND ENZYMES

BIOLOGY

STRUCTURE OF NUCLEIC ACIDS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
the bond between two mononucleotides is called?
A
carbon carbon double bond
B
hydrogen bond
C
phosphodiester bond
D
disulfide bond
Explanation: 

Detailed explanation-1: -The bond joining two successive nucleotides in the same strand of DNA is called the phosphodiester bond. the phosphodiester bond is the linkage between the 3’ carbon atom of one sugar molecule and the 5’ carbon atom of another, deoxyribose in DNA and ribose in RNA.

Detailed explanation-2: -DNA and RNA are composed of nucleotides that are linked to one another in a chain by chemical bonds, called ester bonds, between the sugar base of one nucleotide and the phosphate group of the adjacent nucleotide.

Detailed explanation-3: -A phosphodiester bond is a linkage in which 3’ phosphate group of a nucleoside is linked to the 5’ hydroxyl group of another nucleoside. The direction is always from the 3’ to 5’ in nucleotides. Q. DNA is a polymer of nucleotides which are linked to each other by 3-5 phosphodiester bond.

Detailed explanation-4: -In chemistry, a phosphodiester bond occurs when exactly two of the hydroxyl groups ( −OH) in phosphoric acid react with hydroxyl groups on other molecules to form two ester bonds. The “bond” involves this linkage C−O−PO−2O−C.

Detailed explanation-5: -How do the nucleotides bond? The links between the nucleotides are the phosphodiester bonds (nucleotide phosphodiester bond). As far as the anatomy of the chemical reaction is concerned, there is a free-OH group available at the 3′ end present at the 3′-carbon of the sugar.

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