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Question
The structure of DNA is
The structure of DNA is
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Solution
The correct option is C Double helix
Double helix is a term used to describe the structure of DNA.
A DNA double helix consists of two spiral chains of deoxyribonucleic acid. The shape is similar to that of a spiral staircase. DNA is a nucleic acid composed of nitrogenous bases (adenine, cytosine, guanine, and thymine), a five-carbon sugar (deoxyribose), and phosphate molecules. The nucleotide bases of DNA represent the stair steps of the staircase, and the deoxyribose and phosphate molecules form the sides of the staircase.
adenine forms a base pairing with thymine whereas cytosine pairs with guanine. This is the only pairing that takes place – A pairs with T and C with G. This pairing is referred to as the base complementary rule since the DNA strands are complementary to one another. Consequently, when the sequence of a strand is TTGGCCAA, then the complementary strand should have AACCGGTT as its sequence.
As a result of this base pairing, DNA strands are antiparallel, complementary to one another and running in the opposite directions. That is to say, the 5′ carbon end of one of the strands faces the 3′ carbon end of its complementing strand. 
Double helix is a term used to describe the structure of DNA.
A DNA double helix consists of two spiral chains of deoxyribonucleic acid. The shape is similar to that of a spiral staircase. DNA is a nucleic acid composed of nitrogenous bases (adenine, cytosine, guanine, and thymine), a five-carbon sugar (deoxyribose), and phosphate molecules. The nucleotide bases of DNA represent the stair steps of the staircase, and the deoxyribose and phosphate molecules form the sides of the staircase.
adenine forms a base pairing with thymine whereas cytosine pairs with guanine. This is the only pairing that takes place – A pairs with T and C with G. This pairing is referred to as the base complementary rule since the DNA strands are complementary to one another. Consequently, when the sequence of a strand is TTGGCCAA, then the complementary strand should have AACCGGTT as its sequence.
As a result of this base pairing, DNA strands are antiparallel, complementary to one another and running in the opposite directions. That is to say, the 5′ carbon end of one of the strands faces the 3′ carbon end of its complementing strand.
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