THE MOLECULAR BASIS OF INHERITANCE
STRUCTURE OF NUCLEIC ACIDS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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condesation reaction
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hydrolysis reaction
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between the pentose sugar of one and the phospate group of another
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between the pentose sugar of one and the pentose sugar of another
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between nitrogen conatining organic base of one and the phospate group of another
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Detailed explanation-1: -The first ester bond already exists between the phosphate group and the 5’ carbon of the pentose sugar of the nucleotide. The second ester bond is formed between the hydroxyl group (–OH) attached to the 3’ carbon of the preceding sugar molecule and the phosphate group.
Detailed explanation-2: -Thus, phosphate and pentose sugars of DNA are joined by phosphodiester linkage; the correct answer is B.
Detailed explanation-3: -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-4: -It is a very strong covalent bond. Two or more nucleotides are attached to one another via the phosphodiester bond. A phosphodiester bond is formed between two nucleotides when the phosphate group of one nucleotide reacts with the hydroxyl group present at the third carbon of another nucleotide.