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Thermodynamics — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryThermodynamics1 Mark
MCQ
Two samples of $\text{DNA, A }$ and $B$ have melting points $340K$ and $350K$ respectively. This is because :
  • ✓
    $B$ has more $GC$ content than $A$
  • B
    $A $ has more $GC$ content than $B$
  • C
    $B$ has more $AT$ cotent than $A$
  • D
    both have same $AT$ content
✓

Answer

Correct option: A.
$B$ has more $GC$ content than $A$
The $B$ sample of $\text{DNA}$ having higher melting point must be having more $GC$ content as comppared to sample $A$.
Since $GC$ base pair having $3$ hydrogen bonds as compare to $AT$ base pair having only $2$ hydrogen bonds, results in stronger bonding.

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