DNA strands containing 20 base pairs, 40 base pairs, and 60 base pairs were denatured and the results were graphed below. Identify the curve from the 60 base pair DNA strand.
A) A
B) B
C) C
D) Not enough information is included to determine the curve.

Question

DNA strands containing 20 base pairs, 40 base pairs, and 60 base pairs were denatured and the results were graphed below. Identify the curve from the 60 base pair DNA strand. 
A) A 
B) B 
C) C 
D) Not enough information is included to determine the curve.

Quizplus · Accepted Answer

The curve for the 60 base pair DNA strand will have a higher melting temperature than the curves for the shorter DNA strands. This is because longer DNA strands require more energy to break apart the hydrogen bonds that hold the two complementary strands together. Curve C shows a higher melting temperature compared to the other curves, indicating that it corresponds to the 60 base pair DNA strand.

DNA Strands Containing 20 Base Pairs, 40 Base Pairs, and 60