1
Question
Read the passage carefully and answer the question given below.
In 1953, based on the data given by Maurice Wilkins and Rosalind Franklin, the famous double helix structure of DNA was proposed by James Watson and Francis Crick.
Which among the following is correct with respect to the double helical model of DNA?
[1 mark]
Read the passage carefully and answer the question given below.
In 1953, based on the data given by Maurice Wilkins and Rosalind Franklin, the famous double helix structure of DNA was proposed by James Watson and Francis Crick.
Which among the following is correct with respect to the double helical model of DNA?
[1 mark]
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Solution
The correct option is B The two strands of DNA run antiparallel to each other
DNA is a polymer of nucleotides. The structure of DNA was given by Watson and Crick who stated that there are 2 polynucleotide chains that form a double helix.
One end of the DNA strand is called 5' end and the other end is called the 3' end. The 5' and 3' refer to the number of the carbon atom in a deoxyribose sugar molecule.
The two strands of DNA are antiparallel, it means, if one strand has the polarity 5'→3', the other has 3'→5’.
Below is the image to show the antiparallel behaviour of the double stranded DNA.
The two strands of DNA are not identical, rather they are complementary. Adenine on one strand pairs with thymine on the other strand by two hydrogen bonds. Guanine on one strand pairs with cytosine on the other strand by three hydrogen bonds. This is called complementary base pairing.
DNA is a polymer of nucleotides. The structure of DNA was given by Watson and Crick who stated that there are 2 polynucleotide chains that form a double helix.
One end of the DNA strand is called 5' end and the other end is called the 3' end. The 5' and 3' refer to the number of the carbon atom in a deoxyribose sugar molecule.
The two strands of DNA are antiparallel, it means, if one strand has the polarity 5'→3', the other has 3'→5’.
Below is the image to show the antiparallel behaviour of the double stranded DNA.
The two strands of DNA are not identical, rather they are complementary. Adenine on one strand pairs with thymine on the other strand by two hydrogen bonds. Guanine on one strand pairs with cytosine on the other strand by three hydrogen bonds. This is called complementary base pairing.
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