CBSE 2025 · Region 7 · Set 2 · Q24 · 3 marks
The base sequence in one of the strands of DNA is : 'TAGCATGAT'(a)Give the base sequence of its complementary strand.(b)How are these base pairs held together in DNA molecule ?(c)Explain the base complementarity rule. Name the scientist who framed this rule.
The base sequence in one of the strands of DNA is : 'TAGCATGAT'
(a)
Give the base sequence of its complementary strand.
(b)
How are these base pairs held together in DNA molecule ?
(c)
Explain the base complementarity rule. Name the scientist who framed this rule.
Marking-scheme solution
(a)
‘A T C G T A C T A’
(b)
Base pairs are held by weak hydrogen bonds/ A pairs with T with two H-
bonds and G pairs with C forming three H-bonds
(c)
• In a double-stranded DNA the ratios between Adenine and Thymine
and Guanine and Cytosine are constant and equal to one .
• Erwin Chargaff
Molecular Basis of InheritanceThe DNAApplyshort_answereasy
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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.