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The Tm value of DNA decreased with the increasing of (A+T) /(G+C) value.

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For purified DNA sample, the value of OD260/OD280 lower than 1.8 indicating the sample contains RNA.( )

Most of the DNA molecules are negatively supercoiled naturally in organisms.( )

The DNA renaturation normally take place at a temperature which is about 20 degree lower than its Tm value.( )

The component of bases in DNA from different biological tissues are different.( )

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