CBSE 2025 · Region 4 · Set 2 · Q25 · 3 marks
Study the given below single strand of deoxyribonucleic acid depicted in the form of a "stick" diagram with $\displaystyle 5$' - $\displaystyle 3$' end directionality, sugars as vertical lines and bases as single letter abbreviations and answer the questions that follow.
(a)Name the covalent bonds depicted as (a) and (b) in the form of slanting lines in the diagram.(b)How many purines are present in the given "stick" diagram ?(c)Draw the chemical structure of the given polynucleotide chain of DNA.
Study the given below single strand of deoxyribonucleic acid depicted in the form of a "stick" diagram with $\displaystyle 5$' - $\displaystyle 3$' end directionality, sugars as vertical lines and bases as single letter abbreviations and answer the questions that follow.
(a)
Name the covalent bonds depicted as (a) and (b) in the form of slanting lines in the diagram.
(b)
How many purines are present in the given "stick" diagram ?
(c)
Draw the chemical structure of the given polynucleotide chain of DNA.
Marking-scheme solution
(a)
(a)
Phosphoester linkage/ Phosphoester bond
(b)
Phospho-di-ester linkage / Phospho-di-ester
bond
(b)
Two
(c)
Molecular Basis of InheritanceThe DNAApplyshort_answermedium
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CBSE Class 12 Biology past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.