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What is the range of melting point temperatures (Tm) for most DNA molecules?

  • A.50 to 60°C
  • B.60 to 80°C
  • C.70 to 90°C
  • D.80 to l00°C

Answer: D

Correct answer: 80 to l00°C

Most DNA melts between about 80 and 100°C under standard conditions, with the exact value set by GC content and by the salt concentration of the buffer. This is why PCR denaturation steps are run at 94-95°C.

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