3
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.
According to the double helix model of DNA structure, the backbone of the polynucleotide chains of DNA is composed of ____________.
[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.
According to the double helix model of DNA structure, the backbone of the polynucleotide chains of DNA is composed of ____________.
[1 mark]
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Solution
The correct option is C sugar and phosphate groups
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 polynucleotide chains are formed of multiple nucleotide (composed of deoxyribose sugar, phosphate and nitrogenous base) units which are joined by phosphodiester bonds. The backbone of the chains are made up of the sugar and phosphate groups whereas the nitrogenous bases are projected inwards. 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 polynucleotide chains are formed of multiple nucleotide (composed of deoxyribose sugar, phosphate and nitrogenous base) units which are joined by phosphodiester bonds. The backbone of the chains are made up of the sugar and phosphate groups whereas the nitrogenous bases are projected inwards. Hence option c is correct.
Figure : DNA double helix structureSuggest Corrections
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