1. Tardigrade
  2. Question
  3. Biology
  4. Two students are given two different double -stranded DNA molecules of equal length. They a re asked to denature the DNA molecules by heating. The DNA given to student A has the following composition of bases ( A: G: T: C :: 35: 15: 35: 15) while that given to student B is (A: G: T: C :: 12: 38: 12: 38). Which of the following statements is true?

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Q. Two students are given two different double -stranded DNA molecules of equal length. They a re asked to denature the DNA molecules by heating. The DNA given to student A has the following composition of bases $( A : G : T : C :: 35 : 15 : 35 : 15)$ while that given to student $B$ is $(A : G : T : C :: 12 : 38 : 12 : 38)$. Which of the following statements is true?

KVPYKVPY 2010

Solution:

In a DNA, adenine is paired with thymine with double bond and guanine is paired with cytosine with triple bond.
We know that double bonds are easier to break than triple bonds.
Student $A$ has more $A = T$ than $G = C$, while student $B$ has more $G = C$ than $A=T$.
Therefore, the $DNA$ molecule given to student $A$ would denature faster than that given to student $B$.