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.
How many hydrogen bonds help in the complementary base pairing between guanine and cytosine?
[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.
How many hydrogen bonds help in the complementary base pairing between guanine and cytosine?
[1 mark]
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Solution
The correct option is C 3
According to the Watson and Crick model of DNA structure, DNA is composed of two antiparallel polynucleotide chains ( 5' → 3' and 3' → 5') wrapped around each other in a helical fashion.
The complementary bases of the two polynucleotide strands of a DNA double helix are bound together with the help of hydrogen bonds. Adenine pairs with thymine using 2 hydrogen bonds and cytosine pairs with guanine using 3 hydrogen bonds. Hence option c is correct.
Figure : DNA double helix structure
According to the Watson and Crick model of DNA structure, DNA is composed of two antiparallel polynucleotide chains ( 5' → 3' and 3' → 5') wrapped around each other in a helical fashion.
The complementary bases of the two polynucleotide strands of a DNA double helix are bound together with the help of hydrogen bonds. Adenine pairs with thymine using 2 hydrogen bonds and cytosine pairs with guanine using 3 hydrogen bonds. Hence option c is correct.
Figure : DNA double helix structureSuggest Corrections
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