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10. Biomolecules — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistry10. Biomolecules1 Mark
MCQ
In $DNA,$ the complimentary bases are
  • A
    adenine and guanine; thymine and cytosine
  • B
    uracil and adenine; cytosine and guanine
  • ✓
    adenine and thymine; guanine and cytosine
  • D
    adenine and thymine; guanine and uracil.
✓

Answer

Correct option: C.
adenine and thymine; guanine and cytosine
c
$DNA$ has a double helical structure. These helix contains polynucleotide chains and these chains are held together by hydrogen bonds. In this polynucleotide chain of $DNA$, addenine has thymine opposite to it and guanine has cytosine opposite to it.

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