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

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

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

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The UV absorption value of nucleic acid is unrelated to the pH value of solution.( )

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Which of the following statement is NOT true about the virulence transformation experiment of Diplococcus pneumonia carried out by Griffith and Avery:____

A. Only S type of Diplococcus pneumonia has the capsule which is similar to cell wall.
B. In Griffith’s experiment, if S type strain and heat-denatured R type strain was injected into mice, the mice would not die.
C. The virulence transformation of bacterial strain is mainly related to the capsule of the S type strain.
D. The transformation of alive R type strain to S type strain could also happen in the tube besides happening in vivo in the mice.

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