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Question
What bonds link the two complementary strands of the DNA molecule?
What bonds link the two complementary strands of the DNA molecule?
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Solution
The correct option is C Purine - pyrimidine hydrogen bonds
The bonds that link the two complementary strands of the DNA molecule are weak hydrogen bonds present between nitrogenous bases.
Adenine (A) forms two hydrogen bonds with thymine (T).
Guanine (G) and cytosine (C) are held with three weak hydrogen bonds.
The figure below depicts the base pairing of purines with pyrimidines with the help of H-bonds.
When pentose sugar condenses with a nitrogenous base through a glycosidic bond, a nucleoside is formed.
When a phosphate group is linked to 5' -OH of a nucleoside through phosphoester linkage, a nucleotide is formed.
Nucleotides are linked to one another by ester bonds present between the sugar of one nucleotide and the phosphate group of the adjacent nucleotide.
The bonds that link the two complementary strands of the DNA molecule are weak hydrogen bonds present between nitrogenous bases.
Adenine (A) forms two hydrogen bonds with thymine (T).
Guanine (G) and cytosine (C) are held with three weak hydrogen bonds.
The figure below depicts the base pairing of purines with pyrimidines with the help of H-bonds.
When pentose sugar condenses with a nitrogenous base through a glycosidic bond, a nucleoside is formed.
When a phosphate group is linked to 5' -OH of a nucleoside through phosphoester linkage, a nucleotide is formed.
Nucleotides are linked to one another by ester bonds present between the sugar of one nucleotide and the phosphate group of the adjacent nucleotide.
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